Hi, this is my first post, and im trying to compare a matrix to find the minus element greater than zero, my list is

matrix=

[9,8,12,15],

[0,11,15,18],

[0,0,10,13],

[0,0,0,5]

I dont want to use "min" function because each element is associated to (X,Y) position.

Thanks a lot !

jDSL