How do one save the output of matlab script when it runs for many days?

Hello all---

I have a matlab script that run for 6-7 days. But, to be on safer side i want to save the output of the script at regular interval.This is to avoid the chances of loosing the data in case of unexpected termination. Is there a way to do this ?

In the script, there are loops inside a function.

Thanks in advance !

Answer 1

[KSSV]

YOu can save the data into a mat file....check the following example:

filename='test.mat';
m = matfile(filename, 'Writable', true); %Note: writable is true by default IF the file does not exist
for i = 1:10 
  x = randn(1,100);
  out = x.^2; %whatever you put into out is overwritten here anyway
  m.out(i, 1:100) = out;
end
clear m;

Read more here: https://in.mathworks.com/matlabcentral/answers/33113-append-save-same-variable-with-updated-values-into-mat-file-row-wise

[P K]

Thanks for reply KSSV. Can you please check the Comment I have written in Walters reply? I think I didn't ask my question clearly.

[Muhamed Eliyas]

Display the current state of your knowledge • Calculate currentKnowledge using the same relationship as before, and the t we just calculated: k= −1 e−t/τ • Display the following text: At this time, I know X% of MATLAB

Please answer me with output

Answer 2

[Walter Roberson]

If you are talking about output to the command window, then you can use diary

Otherwise there is pretty much only save . You could consider having a timer object save the current content of variables that are in the base workspace.

[P K]

@walter thanks for your response. Sorry for delay in replying.

Actually,I have a function. The function contains loop inside it.I can obtain the output of the function but i want to save the values at each iterations. This would avoid to run the whole loop again, if the code stops unexpectedly

%% This is just an example
function dy = fun(t,y)
  N = numel(y)-1;
  Pn = y(1:N);
  P  = y(N+1);
  dPn = zeros(N,1);
  for n = 2:N
    summe = 0.0;  
    for r = 1:n-1
      summe = summe+Pn(r)*Pn(n-r)
    end
    dPn(n) = -2*kp*Pn(n)*P + 0.5*2.0*kp*summe;
  end
  dP = ?
  dPn(1) = ?
  dy = [dPn;dP]
end

%% Can I save the output for each n,r so that I don't run the code again if it stops unexpectedly. 

Thanks!

[Walter Roberson]

You can call save() yourself, or you can use KSSV's idea of using matfile which will automatically write into the file, even extending variables, which might be more efficient.