Average positive numbers in a row

Question

I have a numpy matrix, and each row has a combination of positive and negative numbers.

I want to create a new vector, that gives me the average of all the positive numb

Answer 1

A possible solution would be

• select all non-negative
• compute explicitly the mean as sum/count

In code:

notneg = x >= 0
result = (x * notneg).sum(1) / notneg.sum(1)