MATLAB: How to chose random row which contain non-zero element

non zero rowrandom row

For example ;
A=[    0     0     0     0 ;
     0     0     0     0;
     0     0     0     0;
     0     0     0     8;
     0     0     0     0;
     0     0     8    11;
     0     0     0     0;
     0     0    11    14;
    11     0     0    14;
     0     0     0     0;
     0     8     9    14;
     0     9     0     0;
     0     9     0    14;
     8     9    11     0;
     0     0     0     0;]
If all row element zero for example row 15 I want to take another row random which contain non zero element

Best Answer

I would first find the non-zero rows, then choose randomly amongst them:
nzr = find(sum(A,2)>0);                             % Indices Of Non-Zero Rows
random_nz_row = nzr(randi(length(nzr), 1))          % Choose One Non-Zero Row
nz_row = A(random_nz_row,:)                         % Display Random Non-Zero Row
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