For loop: saving variables for each iteration

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Giulia Orioli
Giulia Orioli 2018-1-22
评论： Fangjun Jiang 2018-1-23
Hi,
I am just starting using MatLab, so please accept my apologies if this question sounds very stupid or easy. I have tried reading many questions that seemed related but did not find the solution to my problem (or at least I didn't recognise it as such).
I am creating an experiment (using Psychtoolbox) that uses a for loop. Within this loop there is a random permutation of an array. What I would like to do is obtaining, at the end of the loop, a matrix/xls file/csv file showing in consecutive lines the value of the permutation for each iteration of the loop.
My script looks like this:
for j = 1:4
AvailableTrials = [1 2 3 4];
ATsize = numel(AvailableTrials);
MyTrial = AvailableTrials(randperm(ATsize, 1))
if MyTrial == 1
runscriptone; % these are other scripts already present in the same directory
elseif MyTrial == 2
runscripttwo;
else
runscriptthree;
end
end
I would like my output to look something like this:
j . MyTrial
1 . 2
2 . 4
3 . 1
4 . 2
5 . 3
6 . 1
etc
I hope this makes sense and that somebody will be able to help me. Thank you!

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采纳的回答

Fangjun Jiang
Fangjun Jiang 2018-1-22
编辑：Fangjun Jiang 2018-1-23
Add a few lines to create your desired output in a text file.
fid=fopen('output.txt','w+t');
fprintf(fid,'j . MyTrial\n');
for j = 1:4
AvailableTrials = [1 2 3 4];
ATsize = numel(AvailableTrials);
MyTrial = AvailableTrials(randperm(ATsize, 1))
if MyTrial == 1
runscriptone; % these are other scripts already present in the same directory
elseif MyTrial == 2
runscripttwo;
else
runscriptthree;
end
fprintf(fid,'%d . %d\n',j,MyTrial);
end
fclose(fid);
  2 个评论
Giulia Orioli
Giulia Orioli 2018-1-23
Hi Fangjun, thank you for your answer. This works, but records only the information for the last trial, not for all of them.
Fangjun Jiang
Fangjun Jiang 2018-1-23
There is one typo. In the last fprintf() line, the loop variable should be j (instead of i previously). However, if you've figured this out already, I thought the output was right, like below
j . MyTrial
1 . 4
2 . 1
3 . 3
4 . 2

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