Running a script multiple times and recording outputs for each of the runs separately

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Uros Jovanovic
Uros Jovanovic 2017-9-8
评论： José-Luis 2017-9-9
Hi all,
I'm having a function (say A) that generates a random n by n matrix (I need the value of n=8) and I use those numbers to calculate a cost function (B). So I need to run the first function A multiple times (lets say 1000 times) giving me 1000 different 8 by 8 matrices of random numbers and then calculating the cost function using those 1000 different matrices.
Here is my A function:
function [S]=main23(n)
%// n - matrix size (in my case it's 8)
[ ii jj ] = ndgrid(1:n); %// rows and columns of S
ii = ii(:);
jj = jj(:);
success = 0; %// ...for now
attempt = 0; %// attempt count (not really needed)
while ~success
attempt = attempt + 1;
S = NaN(n, n); %// initiallize result. NaN means position not filled yet
t = 1; %// number t is being placed within S ...
u = 1; %// ... for the u-th time
mask = true(1, numel(ii)); %// initiallize mask of available positions
while any(mask) %// while there are available positions
available = find(mask); %// find available positions
r = randi(numel(available), 1); %// pick one available position
itu = ii(available(r)); %// row of t, u-th time
jtu = jj(available(r)); %// col of t, u-th time
S(itu, jtu) = t; %// store t at that position
remove = (ii==itu) | (jj==jtu);
mask(remove) = false; %// update mask of positions available for t
u = u+1; %// next u
if u > n %// we are done with number t
t = t+1; %// let's go with new t
u = 1; %// initiallize u
mask = isnan(S(:)); %// initiallize mask for this t
end
if t > n %// we are done with all numbers
success = 1; %// exit outer loop (inner will be exited too)
end
end
end
So I need this function to run 1000 times for example and to record each of the 1000 matrices. Any idea, please?
Thank you.

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回答（2 个）

Rik
Rik 2017-9-8
If your code takes a very long time you might go for saving each result to a separate mat file. This would also enable running the code concurrently on different machines, provided that they share some disk. (generate file names with something like sprintf('%sresult%05d.mat',currentPath,currentCount))
Another option is to save the results in one cell array.
  1 个评论
Uros Jovanovic
Uros Jovanovic 2017-9-8
编辑：Uros Jovanovic 2017-9-8
Could you explain a little bit, please? I need to run the whole code above for about 1000 times, don't know how to do that, and to record each of the matrices that I get from running the above code 1000 times. I mean, is there a faster way than just clicking on the execute button 1000 times?

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Image Analyst
Image Analyst 2017-9-8
Try this:
for k = 1 : 1000
S{k}=main23(n);
end
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Uros Jovanovic
Uros Jovanovic 2017-9-9
Thanks, but now I need to transform these cell arrays into matrices. In other words, each of the cell array needs to be a matrix (for example s(1)=S{1}), any thoughts?

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