cern.colt.matrix.tdouble.algo.solver.preconditioner.DoubleIdentity Maven / Gradle / Ivy

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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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package cern.colt.matrix.tdouble.algo.solver.preconditioner;

import cern.colt.matrix.tdouble.DoubleMatrix1D;
import cern.colt.matrix.tdouble.DoubleMatrix2D;

public class DoubleIdentity implements DoublePreconditioner {

    public DoubleMatrix1D apply(DoubleMatrix1D b, DoubleMatrix1D x) {
        if (x == null) {
            x = b.like();
        }

        return x.assign(b);
    }

    public DoubleMatrix1D transApply(DoubleMatrix1D b, DoubleMatrix1D x) {
        if (x == null) {
            x = b.like();
        }

        return x.assign(b);
    }

    public void setMatrix(DoubleMatrix2D A) {
        // nothing to do
    }

}