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Parallel Colt is a multithreaded version of Colt - a library for high performance scientific computing in Java. It contains efficient algorithms for data analysis, linear algebra, multi-dimensional arrays, Fourier transforms, statistics and histogramming.

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/*
Copyright (C) 1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose 
is hereby granted without fee, provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in supporting documentation. 
CERN makes no representations about the suitability of this software for any purpose. 
It is provided "as is" without expressed or implied warranty.
 */
package cern.jet.math.tlong;

/**
 * Only for performance tuning of compute longensive linear algebraic
 * computations. Constructs functions that return one of
 * 
 * a + b*constant
 * 
a - b*constant
 * 
a + b/constant
 * 
a - b/constant
 * 
 * a and b are variables, constant is fixed, but for
 * performance reasons publicly accessible. Longended to be passed to
 * matrix.assign(otherMatrix,function) methods.
 */
public final class LongPlusMultSecond implements cern.colt.function.tlong.LongLongFunction {
    /**
     * Public read/write access to avoid frequent object construction.
     */
    public long multiplicator;

    /**
     * Insert the method's description here. Creation date: (8/10/99 19:12:09)
     */
    protected LongPlusMultSecond(final long multiplicator) {
        this.multiplicator = multiplicator;
    }

    /**
     * Returns the result of the function evaluation.
     */
    public final long apply(long a, long b) {
        return a + b * multiplicator;
    }

    /**
     * a - b*constant.
     */
    public static LongPlusMultSecond minusMult(final long constant) {
        return new LongPlusMultSecond(-constant);
    }

    /**
     * a + b*constant.
     */
    public static LongPlusMultSecond plusMult(final long constant) {
        return new LongPlusMultSecond(constant);
    }
}