MATLAB: Generate random matrix ‘r’ of size 3 by 4 with number varying between -4 and 6

88

Q

Best Answer

a = -4;
b = 6;
r = (b-a).*rand(3,4) + a;

Related Solutions

MATLAB: How to truncate this matrix

unique(a,'rows')

MATLAB: How to replace half the number of specific element in an array

To change random columns:

>> A=[1 2 3 4 4 1 2 4 4 3 4 4 4 2 1 3 4 4 4 2 1 4 4]
A =
   1   2   3   4   4   1   2   4   4   3   4   4   4   2   1   3   4   4   4   2   1   4   4
>> nnz(A==4)
ans =  12
>> idx = find(A==4);
>> num = numel(idx);
>> A(idx(randperm(num,ceil(num/2)))) = 2
A =
   1   2   3   2   2   1   2   4   4   3   2   4   2   2   1   3   2   4   4   2   1   2   4
>> nnz(A==4)
ans =  6

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