PCA Class Reference

#include <pca.h>

Inheritance diagram for PCA:

Collaboration diagram for PCA:

Public Member Functions
void	reduceDimensionality ()
	Reduce dimensionality. More...
Public Member Functions inherited from DimRedAlgorithm
	DimRedAlgorithm ()
	Empty constructor. More...
void	setInputData (Matrix2D< double > &X)
	Set input data. More...
void	setOutputDimensionality (size_t outputDim)
	Set output dimensionality. More...
const Matrix2D< double > &	getReducedData ()
	Get reduced data. More...

Additional Inherited Members
Public Attributes inherited from DimRedAlgorithm
Matrix2D< double > *	X
	Pointer to input data. More...
size_t	outputDim
	Output dim. More...
Matrix2D< double >	Y
	Output data. More...
DimRedDistance2	distance
	Distance function. More...
FileName	fnMapping
	Save mapping. More...

Detailed Description

Class for making a PCA dimensionality reduction

Definition at line 34 of file pca.h.

Member Function Documentation

reduceDimensionality()

void PCA::reduceDimensionality ( )

virtual

Reduce dimensionality.

Implements DimRedAlgorithm.

Definition at line 28 of file pca.cpp.

{
    subtractColumnMeans(*X);

    Matrix2D<double> C, M;
    matrixOperation_AtA(*X,C);

    Matrix1D<double> lambda;
    firstEigs(C, outputDim, lambda, M);

    Y=*X*M;
    if (fnMapping!="")
        M.write(fnMapping);
}

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

• xmipp/libraries/dimred/pca.h
• xmipp/libraries/dimred/pca.cpp