MATLAB: Randomly divide a matrix

dividerand

hi, i have a 16435*25 matrix that name is input, i want to randomly divided it in 2 parts: one for train and another for validate data, that 70% of its rows randomly selected as train matrix (i.e 11504*25 matrix) and 30% of its rows randomly selected as validate matrix (i.e 4930*25), how can i do this? thanks a lot

Best Answer

For your matrix:
row_idx = randperm(16435, 11504)';
To illustrate:
example = randperm(10, 7)'
example =
     5
     8
     2
     4
     7
     3
    10
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