DSP Blockset

Matrix Multiply

Multiply input matrices.

Library

Math Functions / Matrices and Linear Algebra / Matrix Operations

Description

The Matrix Multiply block multiplies n input matrices, A, B, C, ..., U_n, in the forward direction, where n is specified by the Number of input ports parameter and U_n is the input at the nth port.

• Y = ((((A*B)*C)*D) ... Un)% Equivalent MATLAB code
  

All inputs must have sizes compatible for matrix multiplication; that is, size(A,2) = size(B,1), size(B,2) = size(C,1), and so on. Inputs can be real, complex, sample-based, or frame-based in any combination, but all inputs must have the same precision, single or double. A length-M 1-D vector input at any port is treated as an M-by-1 matrix.

The size of sample-based output Y is [size(A,1) size(Un,2)]. That is, Y is M_A-by-N_Un.

Algorithm

The Matrix Multiply block is optimized to use at most two temporary variables for storage of intermediate results.

Dialog Box

Number of input ports

The number of inputs to the block.

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

Dot Product	Simulink
Matrix Product	DSP Blockset
Matrix Scaling	DSP Blockset
Product	Simulink

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

Matrix 1-Norm

Matrix Product