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I have a problem that produces a numerical matrix mxn being m the number of observations (row) and n the number of variables (column). I need to randomly choose p lines (p < m), without replacement, of this matrix. So I will create a matrix p x n with which I will perform some calculations. How can I do that??
It will not be "create a px matrixn"?
– Rui Barradas
Correct, the matrix is of order p x n. I was wrong in typing. Thank you
– Clodoaldo