MATLAB: Producing random numbers in Matlab

random number generator; random binary numbers; exact numbers in random binary set

How can I produce random binary numbers with exact number of zeros or ones? for example:
[0 1 0 1 0 1 0 0 1 0]  ===> number of ones are 4, 
[1 1 0 0 1 0 0 1 0 0]  ===> again number of ones are 4,  
[1 0 0 1 0 0 0 0 0 1]  ===> number of ones are 3, which is not allowed.
I just want exact number of ones in output of random sets.

Best Answer

n=4
a=randperm(2*n)
out=a>n
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