matfaust::proj::skperm Class Reference

Functor for the SKPERM projector. More...

Public Member Functions
function	skperm (shape, k, varargin)
Public Member Functions inherited from matfaust::proj::proj_gen
function	subsref (self, S)

Additional Inherited Members
Protected Attributes inherited from matfaust::proj::proj_gen
Property	constraint

Detailed Description

Functor for the SKPERM projector.

This projector returns the matrix with k nonzeros of the input matrix per column and per row that maximizes the Frobenius norm.

Usage

    skperm(shape, k): returns a SKPERM projector (functor), shape defines the size of the input matrix (e.g. [1, 10]), k defines the sparsity of the output matrix (k nnz coefficients per row or per column).
    splincol(shape,k,'normalized', bool,'pos', bool): the optional parameters are set. By default both normalized and pos are false.

Parameters

shape	vector of size 2, to define the size of the input matrix.
k	the sparsity parameter.
'normalized',true	(the default) normalizes the projection image according to its Frobenius norm.
'normalized',false	no normalization.
'pos',true	skips the negative values (replaced by zero) of the input matrix.
'pos',false	(the default) negative values are not skipped.

Return values

proj	the skperm projector.

Example

>> import matfaust.proj.*
>> rng(42)
>> M = rand(5, 5)
 
M =
 
    0.3745    0.1560    0.0206    0.1834    0.6119
    0.9507    0.0581    0.9699    0.3042    0.1395
    0.7320    0.8662    0.8324    0.5248    0.2921
    0.5987    0.6011    0.2123    0.4319    0.3664
    0.1560    0.7081    0.1818    0.2912    0.4561
 
>> p = skperm(size(M), 3, 'normalized', false);
>> p(M)
 
ans =
 
         0         0    0.0206    0.1834    0.6119
    0.9507         0    0.9699    0.3042         0
    0.7320    0.8662    0.8324         0         0
    0.5987    0.6011         0         0    0.3664
         0    0.7081         0    0.2912    0.4561
 
>>

Constructor & Destructor Documentation

skperm()

function matfaust::proj::skperm::skperm	(	shape	,
		k	,
		varargin
	)

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The documentation for this class was generated from the following file:

• skperm.m