MATLAB: How to randomizes the order of the rows of a matrix

permrandi

I have a matrix and I want to just change the order of the rows randomly. What is the best way to do this?

Best Answer

M = [1:100]';                  %Your matrix
M = M(randperm(size(M,1)),:);  %Your randomly permuted matrix by row

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MATLAB: Selecting random numbers

Just use rand() to randomly pick a row and column in the range 1 to half the width and extract it subMatrix = fullMatrix(row1:row2, col1:col2); I'm sure you can figure out how to get row1, etc. using rand. (I'm leaving some of the work to you in case this is a homework problem, which it sounds like it is.)

MATLAB: Select randomly “N” rows of a matrix

try:

N=2; % no. of rows needed
M=rand(5)  % generate a 5x5 matrix random
c=randperm(length(M),N)  
B=M(c,:)  % output matrix

Best Answer

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MATLAB: Selecting random numbers

MATLAB: Select randomly “N” rows of a matrix

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