Example usage for org.apache.mahout.math.function DoubleDoubleFunction apply

Introduction

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

Prototype

public abstract double apply(double arg1, double arg2);

Source Link

Document

Apply the function to the arguments and return the result

Usage

From source file:org.qcri.pca.NormalizeJob.java

static void sparseVectorAssign(Vector mainV, final Vector otherV, DoubleDoubleFunction function) {
    java.util.Vector<IndexValue> newZeroElements = new java.util.Vector<IndexValue>();
    Iterator<Vector.Element> nonZeroElements = mainV.nonZeroes().iterator();
    while (nonZeroElements.hasNext()) {
        Vector.Element e = nonZeroElements.next();
        double res = function.apply(e.get(), otherV.getQuick(e.index()));
        if (res != 0)
            mainV.setQuick(e.index(), res);
        else //Don't affect the iterator
            newZeroElements.add(new IndexValue(e.index(), res));
    }//from   ww  w . j a va 2s.  c  om
    for (IndexValue iv : newZeroElements)
        mainV.setQuick(iv.index, iv.value);
}

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