# feynman feynman

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Question

blank matlab icon on taskbar after a change in matlab directory.

The original matlab directory is c:\matlab\r2023 and r2023 was moved to c:\ to replace c:\matlab and renamed as matlab r2023. M...

23 dagar ago | 1 answer | 0

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answerQuestion

plot in designated subfigures in loops

I have the following code. I want to plotsubfigures as required in the comments in main.m. How to plot in designated subfigures ...

29 dagar ago | 1 answer | 0

### 1

answerQuestion

remove inf in quiver

I want quiver(X,Y,u,v), but there's inf entries in u and v at positions x=y. I'm looking for the smartest way to skip these posi...

ungefär 2 månader ago | 1 answer | 0

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answerQuestion

smart function to switch functions

Suppose I want to tune different ode solvers to run: ode23(@fun,...) I want to use 'odesolver' so that odesolver(@fun,...) ac...

ungefär 2 månader ago | 3 answers | 0

### 3

answersQuestion

call function name in the same function

In a function, I need to run this function somewhere within the function like function fun i=1 if i>1 function name ...

ungefär 2 månader ago | 1 answer | 0

### 1

answerQuestion

Save and load models in phase plane app

Though there are Save and load buttons in phase plane app, I don't think they work. I never find any models saved.

2 månader ago | 1 answer | 0

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answerQuestion

uicontrol doesn't work in Matlab 2023a

figure;pauseButton=uicontrol('Style','pushbutton',... 'String','pause','Position',[2000 60 100 100],... 'Callback',@(s...

2 månader ago | 1 answer | 0

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answerQuestion

vectorization examples for efficiency

I wonder if the following expressions are already optimized forms for computational efficiency and if not how to rewrite them? ...

3 månader ago | 1 answer | 0

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answerQuestion

multiple actions following @(src,event) in uicontrol

How to add another action or function to the following Button=uicontrol('Style','pushbutton', 'String','pause','Position',[1800...

3 månader ago | 1 answer | 0

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answerQuestion

Smart way of adding paths

For those using multiple PCs, it is necessary to use a smart way of adding paths. How is it possible to add paths like: a='c:\...

3 månader ago | 1 answer | 0

### 1

answerQuestion

role of flux f in bcfun of pdepe for systems of PDEs

To solve utt=uxx, as the flux term f has a 0 entry in pdefun, the same f is in bcfun. In bcfun, there's q(x,t)f(x,t,u,ux), which...

4 månader ago | 1 answer | 0

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answerQuestion

functions don't take effect

When calling a function involving multiple other functions where some changes are made, new changes don't take effect even when ...

4 månader ago | 0 answers | 0

### 0

answersQuestion

uicontrol to start over a loop

uiwait/uiresume through uicontrol can be used to pause/continue a loop. Is there a corresponding ui+... to start over a loop fro...

4 månader ago | 1 answer | 0

### 1

answerQuestion

concatenate multiple 'OutputFcn' options in odeset?

Is there a way to output both odeplot+odephas2 after modifying the following? options=odeset('OutputFcn',@odeplot,'OutputFcn',@...

4 månader ago | 1 answer | 0

### 1

answerQuestion

3D plots rotated in live scripts

It seems that once 3d plots in animations are rotated, the animation can't be replayed again, for the control slider automatical...

4 månader ago | 1 answer | 0

### 1

answerQuestion

animation turns static in live scripts

I have the following code that works well in m files but not in live scripts because a figure pops up in a separate window and t...

4 månader ago | 0 answers | 0

### 0

answersQuestion

if nested functions supported in live scripts

Are nested functions supported in live scripts? Otherwise, global variables have to be declared as global?

4 månader ago | 1 answer | 0

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answerQuestion

how to output quantities involving time derivatives in pdepe

pdeval only seems to output the solution and the spatial derivative of the solution via [~,dudx]=pdeval(m,x,sol(i,:,1),x). It se...

4 månader ago | 1 answer | 0

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answerQuestion

why does pdepe adopt Petrov-Galerkin?

pdepe is meant to solve parabolic and elliptic PDEs. Petrov-Galerkin seems to be designed to solve convection dominated ones, wh...

4 månader ago | 0 answers | 0

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answersQuestion

how to output quantities within pdefun, bcfun, icfun in pdepe

How to output quantities within pdefun, bcfun, icfun in pdepe? e.g. in pdefun: function [c,f,s] = heatcyl(x,t,u,dudx) c = 1; ...

4 månader ago | 2 answers | 1

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answersQuestion

unable to adjust real time views of surf plots in plot-drawnow animations

In plot-drawnow animations, how to use the mouse to adjust the view of a 3d surf plot? I've found that there's no response to an...

4 månader ago | 1 answer | 0

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answerQuestion

time integration in solvepde (=pde toolbox?)

solvepde (=pde toolbox?) seem to be based on finite elements. If so what time integration (ode23 etc) is adopted?

4 månader ago | 1 answer | 0

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answerQuestion

different PDEs to solve through events in pdepe

There is a model defined by a pointwise PDE solving for u(x,t), i.e. it is PDE1 when u(x,t)>0 and PDE2 when u(x,t)<=0. Can one u...

4 månader ago | 0 answers | 0

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answersQuestion

how to change time integration in pdepe

ode15s is used in pdepe. How to change it to say ode23 etc when in need?

4 månader ago | 1 answer | 0

### 1

answerQuestion

How to stop loops or close figures in live scripts

I wanna use live scripts to run a loop updating an animation because this will allow to playback the animation. In the normal co...

4 månader ago | 1 answer | 0

### 1

answerQuestion

stop animations with pause()

I wanna stop/break/suspend the following animation without using ctrl+c, how? for i=1:10 plot(linspace(0,1),linspace(0,1)...

4 månader ago | 2 answers | 0

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answersQuestion

plot style of 'OutputFcn'=odeplot in odeset

The following code can plot the solution of the ode with 'odeplot' rather than using 'plot'. options = odeset('OutputFcn',@odep...

4 månader ago | 1 answer | 0

### 1

answerQuestion

pdepe/pde1dm's vectorized option

In pdepe, when vectorized is turned on, the elapsed time is the same as that when vectorized is off. Why no improvement? The ...

4 månader ago | 0 answers | 0

### 0

answersQuestion

pde1dm with coupled ODEs

According to the pde1dm manual, pde1dm with coupled ODEs has to do with three additional arguments to the pde1dm function: [sol...

4 månader ago | 1 answer | 0

### 1

answerQuestion

ode23, 45, 15s, 15i for conservative ODEs

Which of ode23, 45, 15s, 15i are dissipative or anti-dissipative for conservative ODEs?

4 månader ago | 1 answer | 0