Attempt to execute SCRIPT pdepe as a function:

Hi dears

I have problem with executing this program. Can anyone explain me what is going on here? /

Attempt to execute SCRIPT pdepe as a function: /Applications/MATLAB_R2019b.app/toolbox/matlab/funfun/pdepe.m Error in kpz (line 7) sol = pdepe(m,@heat1D,@heatIC,@heatBC,x,t);

opts = odeset('RelTol',1e-8,'AbsTol',1e-8);
N=200; xi=0; xf=5; ti=0; tf=5; TIME=tf-ti; 
x = linspace(xi,xf,N);
t = linspace(ti,tf,200);
m = 0;
tic
sol = pdepe(m,@heat1D,@heatIC,@heatBC,x,t);
toc
w = sol(:,:,1);
surf(x,t,w)
xlabel('x')
ylabel('t')
zlabel('w(x,t)')
view([40 55])
%plot(w(200,:))
function [c,f,s] = heat1D(x,t,w,dwdx)
D=4; %0.2;
c = 1;
f = D*dwdx;
s = 1.5*dwdx.^2; %% NO NOISE
%s = 1*dwdx.^2 - 0.5/t; %%White
%s = 0.5*dwdx.^2 - 1/(x*sqrt(t)); %%Pink
%s = -0.5*dwdx.^2 - 0.5/(x*x); %%Brown
%s = 10.5*dwdx.^2 - 0.1*exp(-x*x/t)/t; %%Gauss
end
function w0 = heatIC(x)
w0=2;
end
function [pl,ql,pr,qr] = heatBC(xl,wl,xr,wr,t)
pl = wl;
ql = 0;
pr = 0;
qr = 1;
end

[madhan ravi]

which pdepe -all % what do you get ? 

You have a script named "pdepe.m" probably rename or remove it.

[Okhunjon Sayfidinov]

I will try everything one more time. thanks for your support.

Answer 1

[Cris LaPierre]

Your code runs as is for me. Perhaps you have overwritten the pdepe function? Try clearing it by typing

clear pdepe

Run the code again. If you still get the error, try typing

which pdepe

The result should be something like this

C:\Program Files\MATLAB\R2020a\toolbox\matlab\funfun\pdepe.m

[Cris LaPierre]

Also, what is the name of the script you are writing this code in? You haven't named it pdepe by any chance, have you?

[Okhunjon Sayfidinov]

I have still this problem

Attempt to execute SCRIPT pdepe as a function:

/Applications/MATLAB_R2019b.app/toolbox/matlab/funfun/pdepe.m

Error in pdepe (line 7)

sol = pdepe(m,@heat1D,@heatIC,@heatBC,x,t);

[Okhunjon Sayfidinov]

yeah I have named it as pdepe. Should I change this name to other name?

[madhan ravi]

Do you see the comment I made above?

[Cris LaPierre]

Yes, you should rename your file to something other than pdepe

[Okhunjon Sayfidinov]

Oh, really I tried all you said but not working, still the same result.

How is it working on your Matlab "Cris LaPierre ". Can you give a little detailed information how to put this code on my matlab and use it.

Thanks a lot in advance.

[Cris LaPierre]

[Cris LaPierre]

After renaming your script, be sure to delete the old file. Save As will not remove the original.

[Okhunjon Sayfidinov]

I am trying all my best but I have still this massage. If it is working properly on your Matlab why it is not working on mine. Should I try any other way? Please I need bif support.

[Cris LaPierre]

try

which pdepe -all

Also, try restarting MATLAB.

[Okhunjon Sayfidinov]

Thanks for everyting but I don`t know what is going on with my Matlab. Still the same...

I restarted my lap top and software, did everything but not result.

[Cris LaPierre]

What do you mean "did everything but not result"? Are you no longer getting the error message?

[Okhunjon Sayfidinov]

I got error on my Matlab still, then I tried this code to other laptop and it is working now. i guess there is a problem with my laptop.

What do you suggest to solve this problem on my laptop?

For now i will use other loptop to find solution to my equation.

Thanks dear a lot for your support.

[Cris LaPierre]

This error suggests that MATLAB is finding multiple files called pdepe.m. Let's see what files MATLAB is seeing. What is the result of

which pdepe -all