Assigning probability to each row of a matrix (observation); and creating exogenous demand sample based on observed matrix

1. I have an m by n matrix - would like to assign probability to each row of the matrix.
2. Each row now has a probability associated with it and can be treated as one observation. I need to draw N (the sample size) number of these rows based on their assigned probability. Not sure how to do it. (referred to a link created in 2012 but don't understand the solution)

[Mohammad Sami]

Do you have statistics and machine learning toolbox.

If so you can use the randsample function for a weighted selection of rows.

[SethC]

thanks, figured out.