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 个评论
madhan ravi
2020-3-21
which pdepe -all % what do you get ?
You have a script named "pdepe.m" probably rename or remove it.
Okhunjon Sayfidinov
2020-3-21
采纳的回答
Cris LaPierre
2020-3-21
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 个评论
Cris LaPierre
2020-3-21
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
2020-3-21
Okhunjon Sayfidinov
2020-3-21
madhan ravi
2020-3-21
编辑：madhan ravi
2020-3-21
Do you see the comment I made above?
Cris LaPierre
2020-3-21
Yes, you should rename your file to something other than pdepe
Okhunjon Sayfidinov
2020-3-21
Cris LaPierre
2020-3-21
Cris LaPierre
2020-3-21
编辑：Cris LaPierre
2020-3-21
After renaming your script, be sure to delete the old file. Save As will not remove the original.
Okhunjon Sayfidinov
2020-3-21
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
2020-3-21
try
which pdepe -all
Also, try restarting MATLAB.
Okhunjon Sayfidinov
2020-3-21
Cris LaPierre
2020-3-21
What do you mean "did everything but not result"? Are you no longer getting the error message?
Okhunjon Sayfidinov
2020-3-21
Cris LaPierre
2020-3-21
编辑：Cris LaPierre
2020-3-21
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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