DSP Blockset

Matrix Sum

Sum the elements of a matrix along rows or columns.

Library

Math Functions / Matrices and Linear Algebra / Matrix Operations

Description

The Matrix Sum block sums the elements of an M-by-N input matrix u along either the rows or columns.

When the Sum along parameter is set to Rows, the block sums across the elements of each row and outputs the resulting M-by-1 matrix. A length-N 1-D vector input is treated as a 1-by-N matrix.

This is equivalent to

• y = sum(u,2)         % Equivalent MATLAB code
  

When the Sum along parameter is set to Columns, the block sums down the elements of each column and outputs the resulting 1-by-N matrix. A length-M 1-D vector input is treated as a M-by-1 matrix.

This is equivalent to

• y = sum(u)           % Equivalent MATLAB code
  

The output has the same frame status as the input.

Dialog Box

Sum along

The dimension of the matrix to sum along, row or column.

Supported Data Types

• Double-precision floating point
• Single-precision floating point

To learn how to convert to the above data types in MATLAB and Simulink, see Supported Data Types and How to Convert to Them.

See Also

Matrix Product	DSP Blockset
Matrix Multiply	DSP Blockset
sum	MATLAB

Also see Matrix Operations for a list of all the blocks in the Matrix Operations library.

Matrix Square

Matrix Viewer