Why the given code is not running

function pdex4
m = 0;
x = [0 0.005 0.01 0.05 0.1 0.2 0.5 0.7 0.9 0.95 0.99 0.995 1];
t = [0 0.005 0.01 0.05 0.1 0.5 1 1.5 2];

sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t);
u1 = sol(:,:,1);
u2 = sol(:,:,2);

% --------------------------------------------------------------
function [c,f,s] = pdex4pde(x,t,u,DuDx)
c = [1; 1]; 
f = [0.024; 0.17] .* DuDx; 
y = u(1) - u(2);
F = exp(5.73*y)-exp(-11.47*y);
s = [-F; F]; 
end
% --------------------------------------------------------------
function u0 = pdex4ic(x);
u0 = [1; 0]; 
end
% --------------------------------------------------------------
function [pl,ql,pr,qr] = pdex4bc(xl,ul,xr,ur,t)
pl = [0; ul(2)]; 
ql = [1; 0]; 
pr = [ur(1)-1; 0]; 
qr = [0; 1];
end

% figure
surf(x,t,u1)
title('u1(x,t)')
xlabel('Distance x')
ylabel('Time t')

% figure
% surf(x,t,u2)
% title('u2(x,t)')
% xlabel('Distance x')
% ylabel('Time t')
end

Answer 1

[madhan ravi]

It’s working for me . Make sure you have partial differential equations toolbox by typing ver in your command window.

[MINATI]

Thanks Madhan for your quick response By running the code the following Error shows Attempt to execute SCRIPT pdepe as a function: C:\Users\HP\pdepe.m

Error in pdex4 (line 11) sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t);

[madhan ravi]

change your function filename as pdex4.m

[madhan ravi]

If it’s according to your wish and working please accept the answer.

[madhan ravi]

Haven’t heard from you in a while @Pattnaik. If something is not clear let know.

[MINATI]

Dear Madhan Sorry for being late but file name is already given as yours. Can you do a favour by sending the modified code at [e-mail]

Thanks

[madhan ravi]

check your mail

[MINATI]

your code is running after download and putting RUN option but in my laptop in the following error occurs

Attempt to execute SCRIPT pdepe as a function: C:\Users\HP\pdepe.m

Error in pdex4 (line 7) sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t);

What to do

[madhan ravi]

Do you have partial differential equations toolbox? You should have one if you want to get the output. You can check it by typing ver in your command window.

[MINATI]

yes the version is present

[madhan ravi]

Just download the attached file,

1)Press the green button in the script file OR

2)Type pdex4 in the command window.

[madhan ravi]

Did you try what I said?

[MINATI]

Yes I hv tried but again the following error comes Attempt to execute SCRIPT pdepe as a function: C:\Users\HP\pdepe.m

Error in pdex4 (line 7) sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t);

I think something wrong is happened with my software but other codes are running smoothly

[MINATI]

Thanks Dear Madhan for your patience. Another thing are you OK with Matlab code to solve COUPLED PDE with TWO variables (y & t ) by using LAPLACE TRANSFORM. I need your help Please reply me on [e-mail]

[madhan ravi]

Please accept my answer if it solved your problem.

[Walter Roberson]

You need to rename HP\pdepe.m as it is interfering with MATLAB routine of the same name.

[madhan ravi]

@PRADYUMNA I have no experience with solving PDE

[MINATI]

Hi Walter following error occurs Error using pdepe Too many input arguments.

Error in pdepe (line 6) sol = pdepe(m,@pdex4pde,@pdex4ic,@pdex4bc,x,t);

[Walter Roberson]

Which MATLAB version are you using? And what shows up for

which pdepe

[MINATI]

C:\Users\HP\pdepe.m