Example usage for org.apache.mahout.math.function Functions IDENTITY

Introduction

In this page you can find the example usage for org.apache.mahout.math.function Functions IDENTITY.

Prototype

DoubleFunction IDENTITY

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Document

Function that returns its argument.

Usage

From source file:org.carrot2.matrix.MatrixUtils.java

License:Open Source License

/**
 * Finds the first minimum element in each column of matrix A. When calculating
 * minimum values for each column this version should perform better than scanning
 * each column separately.//from w w  w  .j  a  v a2  s. co  m
 * 
 * @param indices an array of <code>A.columns()</code> integers in which indices of
 *            the first minimum element will be stored. If this parameter is
 *            <code>null</code> a new array will be allocated.
 * @param minValues an array of <code>A.columns()</code> doubles in which values of
 *            each column's minimum elements will be stored. If this parameter is
 *            <code>null</code> a new array will be allocated.
 * @return for each column of A the index of the minimum element
 */
public static int[] minInColumns(DoubleMatrix2D A, int[] indices, double[] minValues) {
    return inColumns(A, indices, minValues, DoubleComparators.REVERSED_ORDER, Functions.IDENTITY);
}

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From source file:org.carrot2.matrix.MatrixUtils.java

License:Open Source License

/**
 * Finds the first maximum element in each column of matrix A. When calculating
 * maximum values for each column this version should perform better than scanning
 * each column separately.//from   w  ww .  j a  va 2  s . c  om
 * 
 * @param A
 * @param indices an array of <code>A.columns()</code> integers in which indices of
 *            the first maximum element will be stored. If this parameter is
 *            <code>null</code> a new array will be allocated.
 * @param maxValues an array of <code>A.columns()</code> doubles in which values of
 *            each column's maximum elements will be stored. If this parameter is
 *            <code>null</code> a new array will be 
 *            allocated.
 * @return for each column of A the index of the maximum element
 */
public static int[] maxInColumns(DoubleMatrix2D A, int[] indices, double[] maxValues) {
    return maxInColumns(A, indices, maxValues, Functions.IDENTITY);
}

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