how can i select a random number from a column of a matrix? and then how to find the location of that number?

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Rajeev Kant
Rajeev Kant on 1 Apr 2018
Commented: Guillaume on 3 Apr 2018
I have a matrix (4x3) and I need to select a value from second column and find the corresponding row number.
For example, A = [11 24 31; 18 19 27; 16 21 34; 23 37 33 28]
Could someone help me?

Answers (1)

Iddo Weiner
Iddo Weiner on 1 Apr 2018
If you use a random number to index the row you want to extract, you will already have what you need:
A = randi(10,[4,3]);
rand_row = randi(size(A,1)) %get random row
rand_number = A(rand_row,2) %get your rand number form the 2nd column
  5 Comments
Guillaume
Guillaume on 3 Apr 2018
Choosing a random number from the 2nd column and getting the corresponding row is exactly equivalent to choosing a random row and getting the corresponding number in the 2nd column. Iddo showed you how to do the latter, so again you'll have to explain why it didn't work for you.

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