GeoSci.xyz SimPEG, 18 Apr 2017

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From YouTube: SimPEG meeting April 18

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Seogi discusses the theory and implementation of the line-source formulation, and some of the challenges and opportunities.

A

Or request that I have going on to osteogenic functions that I just want to have a look at I'll sure miss.

B

You guys can't hear me: okay, yeah.

C

A

John, it's just this objective function multipliers over quest, number, 5, 85, ok,.

B

A

All I've done here is, instead of the multiplier being accessed from the other score. Namespace now they're just an inch possible namespace, except that they are.

B

A

That you probably actually want to easily access.

B

Can you give me an example, so.

A

B

Sorry, oh yeah.

A

Raizle on before, if you look at this example period, so if emphasis search, 53 double closes, impede our 24 before that would have been a certain 530 explore.

C

A

In this case, like all that I've done is I brought it up a little and then I've also put a setter in so basically just to make sure that you give it something. That's same so I wrote a test. I'll show you that's kind of like a helpful thing to look at.

A

So if a bottom here there's a test test updating multipliers. um So, for example, if you try and give it a string or a list of strings you'll fail because we don't have.

B

Yeah, the third case is 0. If you give it an airy instead of a list. Is that the difference? Oh.

A

You should leave it a list or or array I. Those are fine. Nobody.

B

What's the the third case that if here.

A

There's only two: there are only two objective functions, so if you try getting is something that is Lance three. What yep.

B

B

That's great I'll.

A

Let you leave at eight you, a quick look. I didn't know kept changing in your code, so I didn't want to merge it in without thumbs up for you. First are.

B

You merging in my in on my PR or it's a different PR. If.

A

You go into the objections. Okay,.

A

B

I need to I've to come behind you. You pushed a few comments. Yeah, do it and I'll a low just okay,.

A

B

A

Suits you guys want to go over time, ATM furniture. Do you want to go over the PCGS? Oh.

B

A

To you guys, they.

B

Go soggy, I would say, and let's finish with the PCGS.

C

Yeah I'm pretty open mic deal when is that we see? Yes? Is that thing? Oh, so.

A

A

Virtue options there's one in May, which I think would be better I mean, like my name's gene.

A

Race was Thursday, made 18 or thursday jun 15.

A

So I would vote for the 18th form, a 18th yeah, how cuz Jim you're going to be gone.

C

I'm over here with that.

B

A

B

Us how much time our full month, yeah.

A

Yeah I would say things like that should be fine. I mean like a lot of this stuff for background material. We have, and then we do a ton of examples. So it's just a matter of like pulling together and are letting a few things that are both Aronnax. That made.

B

Yeah absolutely who's a you want to give it the talk. Enza.

A

I'm easy tweezer do like how long after it's like an hour, yeah.

B

Yeah we could that we could also I'll stand if you don't have to do it all in a can partition. um Yes,.

A

This always, I think it could be kind of cool to like have a guy, be happy to give a video an overview and then have you guys talked about examples that are at your birth, mom and kind of how a bit of a lebanese.

B

Sounds good to me, yeah.

A

Yeah is the sort of that includes a chance to 50 last questions and we intend.

C

A

For your legs, 45 minute length, presentation and then that gives people a chance to actually ask questions and have a bit of a conversation afterwards right.

B

Yeah, so you, which you give a talk right with tiki seen Sarah. Was it a BCS talk to yes,.

C

It was a bit so.

B

They've they've seen Tiki serving it on.

C

But the I think that is that PCGS thought was for a conference PCGS conference I, don't I, don't think because it's more internal workshop right like where they go to small, like conference room below the mirrors office. Again, that's something we're doing or instead of conference I.

B

Can ask I last up my stocking now but I'll ask him when see ya once he's done, I I.

C

Think I think this is the small workshop with like their monthly workshop I fest. So it's more like internal workshop and then we got bomb I.

B

Think so too, yes yeah! So.

C

Yeah I, like that, yes I, he came on we've like overview and then I was well as his name Thomas. It was you're suggesting demoing like some of the codes I, think, like probably by showing you a quick example, but it'll like you can run on alive that yeah.

B

Yeah yeah, that's probably more.

C

Implicit effective for them, they're very practical guys, like so I'm, not like exactly sure. What's so like to ignite their interest, I think we should Oh some samples, yeah.

B

Yeah we could do like to DDC potential. Fails, Wandy Wandy, emi, guess, Lindsay. We could do that life right. You.

A

Don't all those wife um I think in a lot of these white Devils, we have to really carry with them. It is very easy to sort of get carried away and Showtime code I because were familiar fitting. It's easy for us to get you but otherwise actually create our dating breath right. Oh.

D

A

Yeah quite sure, so our secret, maybe if we take like one maybe two reveals it- may be DC and.

C

A

Show the rest in like because we can put people to like that with notebooks and make sure they've got few more examples out there, so that it will show sort of what we have and.

C

A

A sample I think.

C

We're going to go back, I think probably like like a demo is one example is enough, but not too many example, like probably just show man and gravity yeah, it can run felt refreshed and, like other example, could be just in presentation. Yeah.

B

That's good idea: yeah.

C

Like Rwanda Merle and then a couple examples, yeah.

A

And when he was going to show or samples well, I think.

C

I look do DC like you, oh well, that's what like their conventional tools and then probably what I would show what they usually do. Here's an open source code that you can do it! That's what I? Oh, if I kabob yeah.

A

Absolutely and then Johnny will show with the compact arm, stop maybe you're a virgin yeah.

B

I think the new mag would be interesting because that's that's new code that people can start experimenting wealth. You know and there's a need, there's a need for it. So oh yeah just can't start sketching it out. Okay,.

A

um Maybe what we can do is like a bulldog started and to serve each of us, but look what are the things we want to get across and then we can sort of plan for basically like 15 minutes each week and then.

B

We can shovel it around as.

A

Beautifully, if we need more time for when these apples are off figure out yeah, we sorta disturb it. No long back and.

B

We want to do synthetic right, which is gonna, be easier. Yeah, I think.

A

So I mean if we have sleep, we point to other field examples like grant stuff and just really highlight a few of the Regal things that were doing what yeah, I think for forget all those things like that. Yeah.

C

We could do that probably use tkc example.

C

Here's a common example of these step, yeah to show what you can do, yeah.

B

How about we build something that we can distribute, because then it would be nice right. The department could always go back and just run it on their own on their own computer yeah.

C

Yeah yeah um I'm, open-minded to whatever example like if you can build a common model and then show probably exam.

D

B

D

C

See an IP that probably yes, yeah.

A

Do you want to do the TVC exam or agreed? I'm.

B

A bit sick of it but I'll think how much time we want to spend on it. I guess I mean.

A

Deers have another sort of example, with surfaces in mind, good, like a model that we can who can use. We can give us some thought right.

C

Do you give a good example? Well give a like a synthetic model that you can use I.

B

Was going to build one for for my paper for the kibbutz? Keep it simple, because we already have surfaces and it's it's a it's a nickel deposit. So it's different than the amounts! Oh I.

C

Could get a bit more interesting, but.

B

But it depends how much time we yeah how fast I can deliver it. I guess.

C

Well, yeah for like it depends upon like her pose, like your want to provide something easy and quick example why we should make it much simpler. No.

B

It will be simple here for sure: yeah I'm, just thinking base metals, probably better than diamonds, for the crowd gives very very.

C

B

Few people do diamonds in vancouver's. It is true ah right right and support your honor.

A

B

Be perfect for IP cuz, it's technically a chargeable and yeah.

C

Actually yeah, if you have something and I'm that's a bit of the construction I'm thinking about building a for free model. Okay, so yeah that'll be that'll, be good. I'll.

B

By then, let's go down if it's good-sized.

C

Be used by other spending.

B

A bit more time on that.

C

Then it's like anyway, I need that example to research, so that'll be great. Okay,.

B

Well, I'll show you I'll, send you the section, the simplified section that the judges mad and, if the shape, if the geometry looks good for you, then I'll go for. Oh that.

C

Sounds great to me: okay,.

B

Sounds good I'll fire it to you right now, all right.

A

Sorry, nice folks gate was then be made naked. If we send that email that spot.

C

I'm happy mate.

B

I'm happy yeah Chris, oh.

A

I, don't Forza yeah.

C

It's a thursday I think it's 4pm I, yes, yeah.

A

I think that's what he's.

A

For 3 is what his email said. So we can redeem confirm that we're all up.

A

Dawn, do you want to follow up with him? Is ours ready to take the photo.

B

Booth Thomas Thomas, yeah I'll talk to him right after the meeting earth.

A

Is he he's out here yeah.

B

Sitting right behind me.

A

Ok, that's an interesting section ya.

C

Dumb, I think I'm happy with that. Where is the mineralization so that the gray unit is the mineralization or one.

B

Second, I'm just gonna send you to more than the surface and then it's the mineralization will be decimated inside the the dark gray. Ok,.

C

B

The and and the light gray on top is super magnetic. So that's a good target for me and then you'll see on the section on the plan view we have the planned. You know.

A

B

Yes, it seemed from the top and all those bands are actually I've gone trust or we could. You know we could put values on them right.

C

And that they're, like a kind of region of interest, is about two kilometer bike, two kilometer or that let's.

B

See Oh it's way more and it's about that's about I, think 15, kilometers square, but the mine is about like the fit, is gonna be about a kilometer wide. Okay, you see the the white dash lines yeah, where your thingy, it's about a kilometer. Okay,.

C

Cool okay. But that sounds with you and.

A

This is the one that you're also doing a joint may one yeah.

B

That's right and that's that's the one that they did like seismic interpretation, so we also have to decide smack say we could like just like just tease people into the problem. You know what.

C

B

We have yeah exactly if we have something nice we could, we could share it with their people and then um what the hell I forget, university, whatever there's more people, are gonna, be interested with CM cool.

C

B

Olinsky is that a number yeah? That's that's one right, I'll.

D

Sing e, yes,.

B

A

Okay, awesome on one place. We can perhaps put those for now there's a repository that started back when, like the tkc stuff who's going, that we've never actually put anything in I called geo lulz.

A

So it's synthetic / geo models and like the goal there is to have some of these models where we've got surfaces and like physical properties assigned to rock unit. um So we could perhaps start by putting like the surfaces and even just the maps and a few things in there and just cuz right now, there's nothing in this. So we can sort of starts with define what it should look like in terms of actually storing models that people can then go ahead and use.

B

Okay, yeah I had perfect, it's the same idea, pull request there or we can push directly I.

A

I would maybe do pull request for oh, and that's like a thing then that we can talk about, but there's really we can merge it in pretty quick, good.

B

A

D

A

B

To you, I segi, now yep.

C

Okay, yeah um right so.

A

For us I'm coming in and share my screen, that's as far as this goes yeah or yeah. If you share your string.

A

C

Yeah so I I had to need some partiality for your dinosaurs, so Lindsay get the refactoring for of the frequency in time. Dominion code and I can recently time to me. Encoding yes, see reason yeah, so I didn't even have words indeed change these things and then have a look.

C

So here's a setup like this is a Maxwell's equations in magnetic field, electric field and current elements. So a season integrate current and it includes all the volume terms and then here's a Faraday's law curl up easy to die. Vvip and.

A

Then we use a backhoe loader.

C

To discretize that so here's a set up and then we have a time step starting from zero to empty. So we have NP, plus 1 steps.

C

Well, like higher step is actually energy. Sorry, but like your electric field and magnetic field have m and P plus 1 times, and that's set up the result e. So we can rearrange that equation in this form, so we can solve for it. So you got like yet end step and it's that n, minus 1, so n minus 1 is no, so you can move that to a right hand, side and at the end of the day and here's what's important is like that we compute the derivative of time derivative of SC. So that's.

A

A little bit difference if you write that in in like.

C

That as a function of B, then there is no time derivative. But there's a sen but like that's a little bit of difference between aqua like either you solve, eat or be.

C

So I'm not sure, what's the extent of that, these talk, the idea is like actually going through a little bit of details and then show the implementation. So that's sort of my goal so not sure you guys are really interested that part, but that's what I'm doing so.

C

Okay, so you can write that in a little bit more abstract form, so a a 10 and un plus en and you n minus 1 is equal to write inside so in a matrix form. You can write in this way, so here's like everything is sort of conceptual like you can make a big a bar matrix and then you bar and then rhs bar.

C

So that's what that's the system, what we're solving we're not going to solve this full system by a inverse of right-hand sidebar but like this is sort of conceptual thing would rebuild and then and the four problem. It's like it's a for substitution right because, like this guy is a block block matrix, but you know all of those terms you can solve that. But after that is actually like this for substitution to solve this system.

C

That's how they're solving and the main kind of implementation that I had to do is like this step when n is equal to zero, so usually, if you're using inductive source, you not is known so what we do usually for inductive source, we compute the magnetic vector, potential and compute the beam, and then V naught is now known, but that means V naught is depend, is not its independent on your connectivity structures, but if your susceptibility is like variable, then still you know this depend upon your model.

C

So in that case you should be careful like so depends upon what your model is and then tendency on your initial fields at zero time. You need to be, it will be careful. So previously we assume our initial condition is not depend on our model, but if you are putting a galvanic stores or grounder source now your initial condition is a DC problem or mmm our problem.

C

So you need to solve that initial condition by using the C code and then put that into you know so like now, a knob is a like a bit like it's a Poisson equation to solve and then r your right hand side it's like plus 1 and minus 1, for instance, for DC, so nice that you need someone like a consideration on that part and then like, so that the sea problem can be described.

C

Discretize it like this, so here I'm only focusing on e equal relation, so I'm using a noble gradient, so global radiant moves notes to edges. Ok, so this is the edgy inner product and then this gradient transpose is basically similar to basically actually saying to divergence. So.

A

Your source for that you're, not your, should you have to change the source between the DC and the e/m problem. Is that, like you.

C

Know so uh I'll get there. Yes, so there is another implementation is required, is like okay, how do you compute the right-hand side? I put this kids yeah and the important thing if you go? If you go back to hear like you not here is a electrical field and then but we're not actually solving electrical field for DC problem. We solve the electric potential and then take the gradient to get the electrical field.

C

So here like in that abstract form, a knob is a number of edgy by number of edges, and you not use a number of edges. We're not quite solving that system right. So you like you, need to be smart like so, you need to make us some sort of function.

C

Handle which does this for for problem is ok, but when you're, when you move on to j back or JT back, it's kind of important need to think about your forest and like a or poor sensitivity and an edge in sensitivity and as a function handle which is a little bit tree.

C

Okay, so now I could move on to.

C

Okay, so at the end of day, what we're doing is like resolve this system for each time channel, but you can write that in like a nap in this form as well, we're not actually computing the full a inverse, but we're solving each time channel, so we're looping over time.

C

What I get the question was like the in reality, our signal is like its periodic function so, but we're assuming like 11 period of time. So that's not quite true, so there's a way that we could like implement in that way. So we could assume the period periodic function and then solve a periodic pop up your attic boundary condition. Then you could get the periodic response clear there might be. There is a some there's, a way, I, not exactly sure, but that's probably something like this.

C

So if you pick the periodic boundary condition like this, then you may obtain that right, but not and.

C

So there's yeah, there's some practical consideration that so now jmac is like. We need to compute the derivative of my our fields at ends, time channel regard to a conductivity or whatever inversion model, and at the end of day you could. You could get this form so basically, it's the same same way to solve the system. So we need to solve this forward problem or substitution. We could we could just for substitute this quam matrixes to solve this sensitivity function and then you do time stepping so here that's a reason.

C

The reason why it's important like that that that is not play, we're not by solving this a naught but like a smaller system, but we still need to solve small system and then sorcerer Jack that too edging spaces. So, like there's a bit of fat details well,.

A

You're looking at the fields, rather than using the solution, vector and right.

C

Yes and then like when we are solving the adjoining system. It's similar, but not like right so like now, not not like your first solve, is that here too backward substitution. X is starting from that look at the latest time and then backward propagate to a first time, but still like. We need to be some like consideration on. Do this first time channel because of different size and different okay yeah. So that's how it works and yeah there's a little bit of tails.

C

I'm, not sure it's like all of them are needs to be taken care of here, but, like that's, the gist of what I had to change and then yeah. So that's it and I'll show a little bit of communication. Wise. So important thing is remember that the right how we compete the right hand, side, for instance,.

C

So ha ha great figured, but the geometry is like so you got say. For instance, this is a synthetic model and then my wire path is like goes like this, for instance, like that's a horseshoe, so how you set that the wire pad is like this, so you need for coins like to define that horseshoe, and then you pass that point. So you can stack it like at source, location, X, Y, Z location, then here's a source that line current, that's how you build, and then you need to pass the white ones here.

C

I'm using step off, wait one! So now this line current function is a smart enough to integrate over the path. So I'll show you how that looks like okay, so here's a line, current function and then I have a source type codes dog at it because like this, this this function because they have a multiple years. So if, if the point is not closed, then that's an organic source, but the if the point is that you're completely continuous and enclose it could get inductive source. So that was a reason why men in that pace?

C

You don't need to compute the initial condition, or it still need to be in transition by light.

A

C

Not things like this right and then actually for inversion. It's not the kind of comic comic DVD, so right, so that.

A

Was a reason why I put.

C

A pad on it yeah because there could be multiple use and then so here is.

A

The question 74 victorious: do you.

D

Like Joe Panik.

A

Or do you like around it and yeah.

C

I think I like to galvanic, I'm not sure ground is uh yeah well, yeah Kelly guns could work whether people use like sometimes ground loop, where or maybe they may not use crumbed its route, but um so so there's a difference, grounded and grabbed from big and ground 0. As.

A

Long as you gain an acutely like the wire twister is areas in inductive conan, even if it is grounded yeah.

C

A

I'm I think I'm fine with it being galvanic interested yeah.

C

I'm, open-minded, like people, use rounded I'm, okay with that, but but that's anyway, I read some distinction of the source type here to pretend commendation and so I have a like Vincent get right inside and then here's what I'm on computing the right hand side. So, if you think about like a and now it's a divergence of j s at your right hand side, so once you form a jay s, then you can just simply take the gradient transpose.

A

C

A

Is the DC y'all come on bro.

C

But if you actually think about what's happening, for instance like say you have a wire path up here from here to here and then, if you think about the taking big of divergence, you're going to get all the zeros yeah along the wire path, but you're going to get plus 1 and minus 1 ft at the ends of your like Blanca, so that actually effectively generates awesome, 1 and minus 1 at the social cage that they like the location so so, like the only inducted part, is gone yeah by taking the bad virgins.

C

So that's actually like what, if holly words- and here I need to compute the e initial, so I compute the so I can get the solution, DC and then compute that take the nola gradient and get that electrical field. And then here is that derivative because, like that derivative is taken care of. So that's that I haven't implemented a magnetic field one. So if you want to compute the magnetic field on the offline, so you need to take. You need to be taken care of the magnetic field, no matter what you solve be or be.

C

You should take care of that to get the right response of them but like if you just interested electrical field or dvd p them down my capture. So at this point, but it's soft but word would.

A

You mind, writing an issue yeah, I'm not just so. We have.

D

It off in it right.

C

Okay yeah, so at least I put a errors. If you try that, but portunities right and the at the end of day, what like what we're calling it as e. Yet so that's how it looks like mej, yes, its space, be, you is still need a distinction of SC plus some pine function, so this time function is actually provides a country. So in it like it like this, what cuz ik you call MJS that, like integration of jas as an SE yeah, so it just inside.

A

C

Just calling that part and then multiply but waveform that you Val fair enough, so that's that's how its structured! uh It's only works for ED formulation,.

C

Right, so that's that's that's the source charm and for problem, so I didn't change at all about the EEO, so I di, like the how you're doing to get initial field. So this section it's stopped working so.

A

C

Once you call they get initial fields that calls the DC problem and yeah so that extra computes, the initial field for for problem, I didn't have any problem I had to change. I think jay bag was fine. I didn't have any problem, so the current structure actually did worked. Well, so I think change anything on gym bag and.

C

Poor jakey bag. I had to change so I I, don't know, I, think I, yeah I didn't want to break it to him. So I put it on like that. Ed formulation so, but I had to build like this is the probably salt some some part I had to change, but I think I didn't change in a general problem class yeah, another class. I think I did change problem.

C

Okay, so if you look at me now, there's a DC in yes, so I want to store the factors. It's like I, don't regenerate it for every time, yeah and then for my all the ways: okay, so only I.

A

Still clearing it after the everyone all update right, yes, I.

C

Think I probably do it in the get initial fields. I guess whenever I compute the initial fields, I think I do right, yeah here!

C

Ok! So that's how I'm doing it right some.

A

Time, you're getting right now whenever.

C

I'm updating the.

C

A

C

Clean in that way, I make sure I'm not like for one with also news: nitration are not updated, but after, like you, move on different iteration, because I you're only able one fields call for a one: grossman: content: migration, I, /, j back baby that you were computed there I think that console investor sure it works in that way, but they did smart in a fight they're not going to recompute the fields for like a drabek, a drink to that right, so yeah.

C

So that case I think this works and yes again, like here's, a get a DC, for instance, and I'm, not sure I kind of like putting here. We could think about that and.

C

Only things that I had to change was here so uh life, so this is the. When t is equal to minus one like that, that part is not taken care of like in there cuz. I.

A

C

Cuz I like to think about like it's starting from zero yeah.

A

C

But we have a minus one step actually, which is an initial condition yeah, so I did put that p is equal to minus 13. Put it in ah right that then we need to generalize here, like I, have a mu, sigma drove and that types of things yeah. So then, like you need to be taking care of your hg formulation. So there was like enough complex it that I didn't want to handle it. So that was the reason why I put it in here as a separate class yeah.

C

Right so yeah, that's about that's about it, and this is where I'm taking care of like more like in an abstract way, but actual implementation, I'm, solving DC problem, yeah and then computes the electrical field in the same way, sensitivity and sensitivity, factors yeah, that's hot, that's how it works.

C

A

C

Is sort of the reserve like it's a it's a fairly simple example like you put five-time champ yeah, so my time said is: please live only a 16 campus and I one millisecond 26, millisecond yeah and then I can invert it. It probably takes several hours, so it's just like pretty big time compared to TC I. Think hurt, like my TC inversion. The same case probably take like a couple minutes so yeah its intensive good timing, but I think they're.

C

Not there are a lot of improvements could be made like, for instance, we can store the factorizations yeah, that's better, like a boost up the walk for a small small problem, and this is the reserve life. So yeah. That's actually works pretty well, so here I'm using a 3d TV to generate synthetic data and then inverting using synthetic oak mastery. It's not in Bush, crying I! Think.

A

Those are on the same color skin, so we're actually like yeah.

C

It's the same clothes getting.

A

Into the right, huh yes,.

C

So galvanic source is actually pretty intensive to find both resistor and the conductors yeah. So simple example, but so it works. Oh yeah, it's basically.

A

Saying example that I use.

C

In my paper, so yeah.

A

C

Works pretty fun yeah and then there could be multiple use. I'm using the step-off wait for now, but if you're using general waveform like all the problems, you're super work yeah. So you could do what be like. You could be EV formulation, but you could to be and also eat in that case, like all the stress activities, and it should be like it's tested, so you should just work so.

A

C

It's not like just if you should need to pick up when you're using the step off and then your day is e stand. They may not work, okay, so other than that. That's other things. One.

A

Of the things I wanted to bring up with the waveforms to UM like, you can go in and add waveforms to the time domain class, there's only like a v10 waveform, you don't necessarily have to give it like the rahway form, plus the interpolation function, handle your go in and add that under the hood, if that's something that would be valuable right.

C

um Yeah, that's something that we could through probably using the proper reason yeah. What.

D

A

C

Because, like they're, changing yes they're changing relatively fast yeah, so every years like if they have a new system and then they have a different time dates and also different survey, use a different town gates and different wait long, so I I wasn't sure. What's because I sort of dangerous, then yeah cuz I people like because I, I think I would it for our code. I think I would like their kind of make a trade off like we're.

C

Not gonna, make it really easy yeah, but just need to think about what the waveform ease yeah and then was there con charities. I don't know I may be. Some people may just give bob at that point. I think that's long yeah, but the usually really like need to force them to think about what that is, and then I try. Okay, I need to discretize this I'm, pretty van yeah I think that's a valuable spam. Okay.

A

That's a very good point: yeah.

C

I guess what your your friend like, yeah, Colorado yeah,.

D

C

Like I think she she didn't have any idea. I guess like what like what she has to do. Yes,.

A

You know that, but we can wait. One yeah.

C

But the it like she doesn't know what, let's put it in yeah, that that's the business to me know and she's ready to start right. So she need to understand what she needs to put it in then, like okay, we had some hollers doctor should force them to. We can.

A

Make it over the easier yeah like.

C

Likely to generate interpolation function and then pass it yeah we came like a kind of simple plot. Is.

A

It actually having to provide any.

C

A

C

Yeah anyway, or we can, we can put like a little bit more parameterization to beat em wave four different times.

A

C

Like change the parameters and those such things, yeah yeah.

D

C

A

That's a great point to that. That's.

D

C

So my to-do list is something like that.

C

So for simulation I like cyclamate the initial condition not for any more problems, I'm amar has not been implemented, so it should be done so Jay bag, gucci bag is done and to do is like we need to solve the DB formulations. Lp h, HJ formulation, I hasn't so it stopped working for a step off function. That's he'll be up to dude and I won't like if yeah I don't know like.

C

If someone has a bigger example and then they're having our time like I might because it can make a little bit faster, yeah problem, sorta, factorizations and in the 44 problem, we're storing the fields but for problem we don't quite me to sort of fields. You know, and especially for you, the Impala is pretty big yeah. We got that yeah.

D

A

Of sources and.

C

You're, like your fields, is huge, so even just running 24 polymer could problem yeah, so we may have an option to not store the fields yeah. The.

A

Other thing to the Cuban to the inverse, you don't actually need all the fields you need to footprint like there's a right.

D

A

Need some of them, um so that would be a good thing to to.

D

Think about implementing.

A

Is basically just like that, stencil that we need for the fields right.

C

You can solve as you go as well, and some practical considerations is the receiver. So now, like a receiver, has some function, for instance like people using filters yeah they fit a low-pass filter, usually for prints, DC MIP it up.

C

So in there all the time like favorite, like rear decay and also for airborne case, they put a filter and the usually get low pass filter to get a nicer, late, I'm data, but that kills the only time data which an interesting so I'm, not sure I'm, not sure, that's like we need to implement it in the inversion code, but that's some practical consideration so time integration.

C

So what we're getting is not a point failure, so they have a time date and then integrate over the time dates in both like any any any types of the m3 way. That does it. So that's sometimes we take good care of it. I can you that's probably important for our warm case, especially when you're DK's really fast.

C

So receiver, like that, the line integration code can be used for receiver as well, so we can build up receiver and the source when when source is inductive, and then you have oh, it's like what whatever water path you could post like, they actually use that line card, but we can actually use the vector potential to integrate over that. ah So those are some practical codes that needs to be done to be used for actual practical cases. Yeah, so I think I would focus on, like probably true first, which is easy.

C

Yeah I'm, not sure about this. To like depends upon who you cause. People have a different opinion. That's.

C

So I'll put that into the shoes so that'll be.

A

Yeah, I think, like once, you've got stupid, HTTP documenting where things are like, let's get into ian dev, and then we can go in sort of try and generalize from there afterwards. Yes,.

D

A

It's up and running so we might as well start using it right.

C

So yeah, if you can merge this cuz I have a colleague I met in Indonesia yeah haha room I'm near hollering: si will he say he wants to use yeah but like yeah I.

A

Got an email I. Oh it's not working! It's.

C

Like he just saw this impact through the pit, I guess: okay,.

A

Too, okay, we can also start deploying pre versions, so we can deploy like beta releases and things like that. um So if there are instances like that that come off that you want to install a a free version, so yeah yeah yeah, we can do that. Yeah.

C

Like not in a hurry, so I can.

A

Give him a different.

C

Option but like I, can merge 2 a.m. that yeah now I'm happy perfect.

A

Next, we're somebody that's really exciting. Oh.

B

Yeah that looks like a lot of work. Congrats innocent verdict.

C

Prayer and it's.

B

Inverting, that's good haha well,.

C

I'm, a young stuff usually impress whenever this just like conventional an inversion. Just sports yeah finished the sensitivity of sensitivity veteran for simulation the test. It then yeah usually works, which is pretty impressive.

A

Very cool, okay, yeah anything else. You guys wanna go over today.

B

No not specifically I have a question for you: Lindsey ya, ya, kin problems share, share things. For instance, let's say you had factorization that you wanted to pass on to a joint problem. You know right to the to the other problem. Can you can you do down? Oh.

A

We don't have that set up right now, but we should be able to so. You want to store like get you one square factors between phones um in.

B

My problem, like I'm I, have to create twice twice the sensitivity matrix which is expensive to do in a bond memory and time I could dig technically just do it once and then share it across problems. If we had that option, oh I.

C

Think that's something what we could do to get that sort of global problem yeah. So if it had a mobile phone, has a sub problems and.

D

That could like a shared sensitivity right.

A

C

That's something what.

C

Work I, don't know like you, you could plant a pair to problems, I'm, not sure how I think.

A

Hearing problems is sketchy because it's unclear like what you should be sharing in between them, um but I think the global problem via kids approach and then as big like specifically say that we want to share sensitivities. um Do you have an example, I.

B

Can I can make it up in yeah, okay,.

A

Yeah, if you have an example of it, then we can sort of start sketching something out from there.

B

Yeah sounds good, I'll, publish a joint problem and it will be in there. Okay,.

A

B

Nice happy to know it's a guy, that's possible yeah.

A

I think that's.