MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur télécharger pdf (Page 564)

100

101

Sort

5-407

5Sort

Purpose Sort the elements in the input by value.

Library Statistics

Description The Sort block sorts the elements in each column of the input using a Quicksort

algorithm. The

Mode parameter specifies the block’s mode of operation, and

can be set to

Value, Index, or Value and Index.

Value Mode

When Mode is set to Value, the block sorts the elements in each column of the

M-by-N input matrix

u in order of ascending or descending value, as specified

by the

Sort order parameter.

val = sort(u) % Equivalent MATLAB code (ascending)

val = flipud(sort(u)) % Equivalent MATLAB code (descending)

For convenience, length-M 1-D vector inputs and sample-based length-M row

vector inputs are both treated as M-by-1 column vectors.

The output at each sample time,

val, is a M-by-N matrix containing the sorted

columns of

u. Complex inputs are sorted by magnitude, and the output has the

same frame status as the input.

Index Mode

When Mode is set to Index, the block sorts the elements in each column of the

M-by-N input matrix

[val,idx] = sort(u) % Equivalent MATLAB code (ascending)

[val,idx] = flipud(sort(u))% Equivalent MATLAB code (descending)

and outputs the sample-based M-by-N index matrix, idx. The jth column of idx

is an index vector that permutes the jth column of

u to the desired sorting

order:

val(:,j) = u(idx(:,j),j)

As in Value mode, length-M 1-D vector inputs and sample-based length-M row

vector inputs are both treated as M-by-1 column vectors.

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MATLAB SIGNAL PROCESSING BLOCKSET 7 Guide de l'utilisateur Page 564

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