MATLAB: Selecting random numbers

random number

i have a matrix 10×10 i want to select random matrix of 5×5 but the selected matrix must be in same order as the original matrix,if i choose 20×20 the random matrix must be 10×10

please help

Best Answer

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.)

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

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

MATLAB: How do i select random indicies from an array

Let's say you have a 10-by-6 matrix m, and you want to select 7 rows at random and make sure there are no repeats. Do this:

m = randi(9, 10,6)
randomRows = randperm(size(m, 1), 7)

randomRows is the array of row numbers , not the actual 6 element rows themselves.

Best Answer

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

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