The sum of matrix elements in a specified dimension.

Syntax

S = Sum(M, DIM)

Argument

Name

Description

M

A vector or a matrix.

DIM

(optional)

The dimension on which to sum. For sums by column, dim = 1. For sums by row, dim = 2. If m is a matrix, dim defaults to 1. If m is a vector and dim is omitted, the sum of the elements is returned, regardless of the vector orientation.

Output

Name

Description

S

The sum of the row/column vector elements. If m is matrix, s will be either a row vector or a column vector, depending on the value of dim.

Example

Find the column sums of a matrix.

Syntax

S = Sum([1,2;3,4], 1)

Result

S = [4, 6]

See Also:

CumSum