MATLAB: Choose elements from array randomly

Question

Hi everyone

I have vector array of elements …

for example a=[1,2,3,4]

how can I choose randomly 10% of the above array????

Help me please

majid

Answer 1

You must be using an older version of MATLAB, do this instead:

   % create vector  
   a = randn(100,1);
   % determine how many elements is ten percent
   numelements = round(0.1*length(a));
   % get the randomly-selected indices
   indices = randperm(length(a));
   indices = indices(1:numelements);
   % choose the subset of a you want
   b = a(indices);