How to produce data randomly from a given matrix without changing the dimension
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I have some data for eg
A=[1;3;5;7;2]
Now i have to produced all these data randomly. Is there any matlab command to produce these data randomly without changing the dimension...Please help...
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More Answers (2)
Image Analyst
on 6 Apr 2014
Yes. It's a 5 row column vector. Of course it's possible to produce it, it just depends on what you mean by randomly. Do you just want to keep using randi(7,5) until your number match those? Like this:
A=[1;3;5;7;2]
% Use a Monte Carlo approach to generate A randomly
count = 1;
while count < 10000000
rv = randi(7, [5, 1]);
difference = abs(rv-A);
if max(difference) == 0
break;
end
count = count + 1;
end
message = sprintf('Found it after %d iterations', count);
uiwait(helpdlg(message));
Please clarify.
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Image Analyst
on 7 Apr 2014
This would have been helpful to include in your original post, don't you think? But it looks like Jan's code does what you want.
Jos (10584)
on 7 Apr 2014
Do you want a random permutation or a random derangement (i.e., none of the elements stays in place, as suggested by your comment to Image Analyst)?
% random permutation
B = A(randperm(numel(A))
% random derangement
B = A ;
if numel(A)>1
while any(B==A) % a rejection method
B = A(randperm(numel(A)) ;
end
else
disp('No derangement possible.')
end
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