The way he is writing this xi, I feel this.

Thank you very much for all the clear explanation! It is really helpful.

Really well explained with the figure. Thank you!

Very useful sketch at the end, it is clear enough why it is called "shooting"

Hey Jeffrey, That is a pretty good explanation of the boundary value problem, thanks a lot for that. Now I have a question about something that doesn't seem to get to my head, at least for now. Let's say we have a boundary value problem and we turn this into an NLP such the dynamics of our system become the constraints, and we are trying to minimize a function that depends on the states and in the set of control inputs of this hypothetical system. When we call, for example, fmincon to solve this, this solver internally is solving these differential equations each iteration and evaluating the function F(j) = y(xf)-yf and persuing to minimize it, so in the end, you have all your states and control inputs that make this function goes to zero and thus have your final time constraints met?

Thanks a lot man!

Just to comment on this last sentence, you use fzero or fsolve for the root-finding and ode45 for the integration, couldn't you use an optimizer for satisfying both?

@pedrocalorio1655

2 жыл бұрын

moreover, the fact that you have root finding and integration in the same problem classify it as a DAE problem?

Good presentation! However, I'm really curious about the writing on the glass. If you stand behind glass and write while the camera is on the other side recording, shouldn't the writing be reflected? I do not understand the mechanism behind the production. Elaboration would be appreciated

@safiashakil4191

2 жыл бұрын

Never mind, I realized the camera must be recording mirror image

@AabhusanAryalOfficial

2 жыл бұрын

@@safiashakil4191 When I first saw this type of video a few years back, I too had the same doubt. Took me a good few months to figure it out!

Hi jaffery plz give refrence for more study

4:35 I still don't get the definition of F.

@_mishi

2 ай бұрын

it is just a function that tells us how off the "mark" we are after shooting. If it is 0 we hit.

I'm stuggling when I have given Neumann boundary condition and I need to find y(x_0)=y_0. :(

Is this video horizontally flipped or is the author able to write in reverse?

@NAMANMARKHEDKAR

Жыл бұрын

Flipped

The question may sound weird, but how exactly is F(xi) = y(x_f) - y_f dependent on xi? Does it mean that my xi dictates how I start from y(0) (i.e. z(0) = xi = slope) and how the function "evolves over time" given z(0) = xi, such that if xi was chosen right I get F(xi) = 0 (i.e. I hit the right target for y(x_f))? In other words: F(xi) denotes how the function y evolved for a particular xi. Am I right? And God alone knows best.

@ProfJeffreyChasnov

Жыл бұрын

Yes

I really like the fact, that we can see you while writing, but my brain starts itching seeing you write from left to right. I guess the video is simply mirrored, but still :D Good lesson anyway :P

@ProfJeffreyChasnov

2 жыл бұрын

Funny. I don't even notice.

Wazzup Jerald Bantilan batak kaayo

Can you show an example please?

@ProfJeffreyChasnov

3 жыл бұрын

Download my lecture notes. I give my Coursera students a programming problem.

@usamamohammed2357

3 жыл бұрын

@@ProfJeffreyChasnov the notes are really helpful sir

@muhammadarif6433

Жыл бұрын

Good example jefferry great

@muhammadarif6433

Жыл бұрын

@@ProfJeffreyChasnov hi sir,, reference plz give

Way buot Bantilan

Refrence give