sum
sum(X) returns sum of vector X elements.
In case X is a matrix:
In case X is a matrix:
- sum(X) returns sum of each of X columns
- sum(X,2) returns sum of each of X rows
Examples
> X = [1:4;2:5]#
1 2 3 4
2 3 4 5
> sum(X)#
3 5 7 9
> sum(X,2)#
10
14
> sum(sum(X))#
24