# sum (Matlab function)

Sum of array elements

## Matlab/Scilab equivalent

Matlab | Scilab

    sum

    sum

## Particular cases

M=sum(A)

  Scilab sum(A) returns the sum of all components of A. So, if A is a vector, then Scilab and Matlab work in the same way. If A is a matrix, Scilab sum(A) gives the sum of all elements of A but Matlab returns the sum of each column. Finally, if A is a multidimensional array, Matlab works on the first non-singleton dimension of A what Scilab does not. So, to be sure to find a Scilab equivalent for Matlab call to sum it is better to precise dimension on which to work.

M=sum(A,dim)

  In Scilab dim=1 is equivalent to dim="r" and dim=2 is equivalent dim="c". In Matlab, dim can be greater then the number of dimension of A (in this case, M=A), in Scilab you will get an error message.

## Examples

Matlab | Scilab

    A = [1,2,3;4,5,6]
    M = sum(A)
    M = [5,7,9]
    M = sum(A,1)
    M = [5,7,9]

    A = [1,2,3;4,5,6]
    M = sum(A)
    M = 21
    M = sum(A,"r")
    M = [5,7,9]