how to make a matrix grow inside a parfor loop?
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Hi, i would like to do this in a parfor loop:
S=[];
for n=in:fin
[s,trueorfalse]=somefunction(someinput);
if trueorfalse
S=[S;s];
end
end
I cannot preallocate because i don't know how much big S will be. I tried some thing but nothing worked so far.
Hope you could help me.
0 Comments
Accepted Answer
Edric Ellis
on 7 May 2014
Edited: Edric Ellis
on 7 May 2014
You should be able to do this. For example, the following works correctly:
S = [];
parfor idx = 1:10
r = rand();
if r > 0.5
S = [S, r];
end
end
3 Comments
Edric Ellis
on 8 May 2014
Did you try precisely that code? That code works correctly all the way back even to MATLAB R2008a. Which version did you try it in?
More Answers (1)
Brian B
on 7 May 2014
You could make S a cell array in the loop, then create a matrix afterward:
somefunction = @(x)deal(x,rand(1)<0.3);
S=cell(100,1);
parfor n=1:100
[s,trueorfalse]=feval(somefunction, n);
if trueorfalse
%S=[S;s];
S{n} = s;
end
end
S = cell2mat(S);
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