DSP Blockset    
Difference

Compute the element-to-element difference along rows or columns.

Library

Math Functions / Math Operations

Description

The Difference block computes the difference between adjacent elements in rows or columns of the M-by-N input matrix u.

Columnwise Differencing

When the Difference along parameter is set to Columns, the block computes differences between adjacent column elements.

For sample-based inputs, the output is a sample-based (M-1)-by-N matrix whose jth column has elements

For convenience, length-M 1-D vector inputs are treated as M-by-1 column vectors for columnwise differencing, and the output is 1-D.

For frame-based inputs, the output is a frame-based M-by-N matrix whose jth column has elements

The first row of the first output contains the difference between the first row of the first input and zero. The first row of each subsequent output contains the difference between the first row of the current input (time t) and the last row of the previous input (time t-Tf).

Rowwise Differencing

When the Difference along parameter is set to Rows, the block computes differences between adjacent row elements.

The output is an M-by-(N-1) matrix whose ith row has elements

The frame status of the output is the same as the input. For convenience, length-N 1-D vector inputs are treated as 1-by-N row vectors for rowwise differencing, and the output is 1-D.

Dialog Box

Difference along
The dimension along which to compute element-to-element differences. Columns specifies columnwise differencing, while Rows specifies rowwise differencing. Tunable.

Supported Data Types

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

Cumulative Sum
 DSP Blockset
diff
 MATLAB

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


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