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Attempt to execute SCRIPT pdepe as a function:

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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

  2 Comments

madhan ravi
madhan ravi on 21 Mar 2020
which pdepe -all % what do you get ?
You have a script named "pdepe.m" probably rename or remove it.
Okhunjon Sayfidinov
Okhunjon Sayfidinov on 21 Mar 2020
I will try everything one more time. thanks for your support.

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Accepted Answer

Cris LaPierre
Cris LaPierre on 21 Mar 2020
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

  14 Comments

Cris LaPierre
Cris LaPierre on 21 Mar 2020
What do you mean "did everything but not result"? Are you no longer getting the error message?
Okhunjon Sayfidinov
Okhunjon Sayfidinov on 21 Mar 2020
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
Cris LaPierre on 21 Mar 2020
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

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