Find mean of arrays values which is bigger than threshold

Let`s say I have array (960x1280)of some numbers, and i want to find mean of numbers which are bigger than some threshold (e.g. 20).

Answer 1

[Jos (10584)]

The following will return the mean across all array elements.

tf = MyArray > Threshold 
MyMean = mean(reshape(MyArray(tf),1,[]))

The reshape is needed in case all elements are above the threshold ...