MATLAB: Extracting Data from Script

3d plotspartial differential equations

I would like to know how to get the data plotted by the script I have made. It was the solution of a pdepe problem. Thank you

Best Answer

Assign those varibles as output arguments 
function [u,data2,x_data]=AdvDiff
m=0;
x=linspace(0,1,10);
t=linspace(0,1,10);
sol = pdepe(m,@AdvDiffpde,@AdvDiffic,@AdvDiffbc,x,t);
% Extract the first solution component as u.
u = sol(:,:,1);
% A surface plot
surf(x,t,u) 
title('Advection Diffusion')
xlabel('Distance,x')
ylabel('Time,t')
zlabel('Concentration,C')
% A solution profile
figure
data2=u(end,:);
plot(x,data2);
title('Advection Diffusion')
xlabel('Distance,x')
ylabel('Concentration,C')
grid on
axis tight
end
Call the dunctions with output arguments (Make all variable as output arguments, those data you needed in the currect working directory)
Example:
>> [u,data2,x_data]=AdvDiff
u =
    1.0000    0.8948    0.8007    0.7165    0.6412    0.5738    0.5134    0.4594    0.4111    0.3679
    0.8889    0.8584    0.8154    0.7624    0.7018    0.6356    0.5652    0.4908    0.4119    0.3270
    0.7778    0.7671    0.7441    0.7092    0.6632    0.6067    0.5401    0.4642    0.3793    0.2861
    0.6667    0.6657    0.6528    0.6279    0.5911    0.5427    0.4832    0.4131    0.3334    0.2453
    0.5556    0.5612    0.5552    0.5376    0.5083    0.4677    0.4161    0.3544    0.2834    0.2044
    0.4444    0.4560    0.4562    0.4451    0.4229    0.3899    0.3466    0.2938    0.2323    0.1635
    0.3333    0.3509    0.3573    0.3527    0.3375    0.3121    0.2771    0.2331    0.1812    0.1226
    0.2222    0.2461    0.2589    0.2610    0.2529    0.2351    0.2082    0.1730    0.1305    0.0818
    0.1111    0.1418    0.1614    0.1704    0.1695    0.1592    0.1404    0.1138    0.0803    0.0409
   -0.0000    0.0381    0.0648    0.0810    0.0874    0.0847    0.0738    0.0554    0.0305         0
data2 =
   -0.0000    0.0381    0.0648    0.0810    0.0874    0.0847    0.0738    0.0554    0.0305         0
x_data =
         0    0.1111    0.2222    0.3333    0.4444    0.5556    0.6667    0.7778    0.8889    1.0000
Now output aruguments are avalible in workspace, thease variable are avalible outside if the function also
See the function file, if you execute the main code without function file, all varible are avalible in workspace. Suggested tho see the documentation (Matlab Function Declaration) and another way define those variables as global variables, please go through this.
Any issue let me know
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