Example usage for weka.core.matrix Matrix getRowPackedCopy

Introduction

In this page you can find the example usage for weka.core.matrix Matrix getRowPackedCopy.

Prototype

public double[] getRowPackedCopy() 

Source Link

Document

Make a one-dimensional row packed copy of the internal array.

Usage

From source file:adams.data.instancesanalysis.pls.SIMPLS.java

License:Open Source License

/**
 * Zeroes the coefficients of the W matrix beyond the specified number of
 * coefficients.//from w w w  .j a va 2 s .c  om
 *
 * @param in      the matrix to process in-place
 */
protected void slim(Matrix in) {
    double[][] B = in.getArray();

    for (int i = 0; i < in.getColumnDimension(); i++) {
        Matrix l = in.getMatrix(0, in.getRowDimension() - 1, i, i);
        double[] ld = l.getRowPackedCopy();
        for (int t = 0; t < ld.length; t++) {
            ld[t] = Math.abs(ld[t]);
        }
        int[] srt = weka.core.Utils.sort(ld);
        //int index = srt.length - 1 - srt[Math.min(getNumCoefficients(),srt.length-1)]; //nonono
        int index = srt[Math.max(srt.length - 1 - getNumCoefficients(), 0)];

        double val = ld[index];
        for (int c = 0; c < in.getRowDimension(); c++) {
            if (Math.abs(B[c][i]) < val) {
                B[c][i] = 0;
            }
        }
    }
}

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