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PCAPreprocessor Class Reference

#include <pcapreprocessor.h>

Inheritance diagram for PCAPreprocessor:

List of all members.

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Detailed Description

Implementation of a PCA (Principal Component Analysis) of the input. A principal component transformation is applied to the whole input vector.

Public Member Functions

• PCAPreprocessor (unsigned int in_rows=1, unsigned int out_rows=1)
• ~PCAPreprocessor (void)
• int process (const double *S, double *X)
• void reset ()
• int importRepresentation (const double *rep, int rep_length)
• double * exportRepresentation (int *rep_length)
• string getFormatDescription ()

Private Attributes

• double * pca_matrix

  The PCA transformation matrix.
  
  

Friends

• class csimClassInfoDB

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Constructor & Destructor Documentation

PCAPreprocessor::PCAPreprocessor (  unsigned int    in_rows = 1, unsigned int    out_rows = 1 )

Constructs a PCA transformation. Initially the transformation is an identical transformation x'=x. Parameters: in_rows  Number of rows in each input vector. out_rows  Number of rows in each output vector.

PCAPreprocessor::~PCAPreprocessor (  void    )

Frees the memory.

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Member Function Documentation

double * PCAPreprocessor::exportRepresentation (  int *    rep_length )  [virtual]

Exports the representation of this preprocessor for use in external objects. Format: first number gives the number of rows for input vectors, second number gives the number of rows output vectors, the following rows elements are the elements of the (m x n) PCA transformation matrix (row by row). The format is [a_11, a_12, ..., a_1n,a_21, ..., a_m1, ..., a_mn]. Parameters: rep_length  Length of the representation vector. Returns: A list of parameters that represent the preprocessor. Warning: Do not forget to free the memory reserved for the representation! Implements Preprocessor.

string PCAPreprocessor::getFormatDescription (    )  [virtual]

Returns a textual description of the representation format for import/export - Representation. Implements Preprocessor.

int PCAPreprocessor::importRepresentation (  const double *    rep, int    rep_length )  [virtual]

Imports the data from an externally (e.g. Matlab) trained preprocessor. Parameters: rep  Representation of the preprocessor as a double vector. Format: first number gives the number of rows for input vectors, second number gives the number of rows output vectors, the following rows elements are the elements of the (m x n) PCA transformation matrix (row by row). The format is [a_11, a_12, ..., a_1n,a_21, ..., a_m1, ..., a_mn]. rep_length  Length of the representation vector. Returns: -1 if an error occured, 1 for success. Implements Preprocessor.

int PCAPreprocessor::process (  const double *    S, double *    X )  [virtual]

Preprocess a state representation. Parameters: S  State of the liquid (= filtered response of the neural microcircuit). X  Target vector where to save the results. Returns: -1 if an error occured, 1 for success. Implements Preprocessor.

void PCAPreprocessor::reset (    )  [virtual]

Resets the information stored within the preprocessor. Implements Preprocessor.

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