Matrix Scaling (DSP Blockset)

DSP Blockset

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Matrix Scaling

See Also

Scale the rows or columns of a matrix by a specified vector.

Library

Matrix Functions, in Math Functions

Description

The Matrix Scaling block scales the rows or columns of the input matrix A by the input vector D.

When the Mode parameter is set to Scale rows, the block multiplies each element of vector D across the corresponding row of matrix A.

This is equivalent to premultiplying A by a diagonal matrix with diagonal D.

y = diag(D)*A        % equivalent MATLAB code

When the Mode parameter is set to Scale columns, the block multiplies each element of vector D across the corresponding column of matrix A.

This is equivalent to postmultiplying A by a diagonal matrix with diagonal D.

y = A*diag(D)        % equivalent MATLAB code

The length of vector D must be consistent with the intended matrix operation (i.e., D must have the same length as the dimension of A being scaled). The output is the same size as the input matrix A.

Note
If you expect to generate code for the Matrix Scaling block using the Real-Time Workshop, you should ensure that inputs are contiguous in memory. See the Contiguous Copy block for more information.

Dialog Box

Mode: The mode of operation, row scaling or column scaling.
Number of columns in A: The number of columns in the input matrix.