Extract values from a matrix

let say I have a matrix:

[ 3 2 4 ; 3 5 1]

I want to extract all the values that are greater than 3 and use all these extracted values to find the mean value.

How should I approach this?

Answer 1

[Guillaume]

mean(yourmatrix(yourmatrix >= 3))  %mean of all values greater than or equal to 3