Example usage for org.apache.commons.math3.linear RealMatrix power

Introduction

In this page you can find the example usage for org.apache.commons.math3.linear RealMatrix power.

Prototype

RealMatrix power(final int p) throws NotPositiveException, NonSquareMatrixException;

Source Link

Document

Returns the result of multiplying this with itself p times.

Usage

From source file:com.opengamma.strata.math.impl.matrix.CommonsMatrixAlgebra.java

@Override
public DoubleMatrix getPower(Matrix m, int p) {
    ArgChecker.notNull(m, "m");
    RealMatrix temp;
    if (m instanceof DoubleMatrix) {
        temp = CommonsMathWrapper.wrap((DoubleMatrix) m);
    } else {/*  w  w w .  j  a va 2  s  . c  o  m*/
        throw new IllegalArgumentException("Can only find powers of DoubleMatrix; have " + m.getClass());
    }
    return CommonsMathWrapper.unwrap(temp.power(p));
}

---

From source file:cz.cuni.mff.spl.evaluator.statistics.KolmogorovSmirnovTestFlag.java

/**
 * Calculates {@code P(D_n < d)} using method described in [1] and doubles (see above).
 *
 * @param d statistic//w  w w.ja  v  a  2s  . c  o m
 * @param n sample size
 * @return \(P(D_n < d)\)
 */
private double roundedK(double d, int n) {

    final int k = (int) Math.ceil(n * d);
    final RealMatrix H = this.createRoundedH(d, n);
    final RealMatrix Hpower = H.power(n);

    double pFrac = Hpower.getEntry(k - 1, k - 1);
    for (int i = 1; i <= n; ++i) {
        pFrac *= (double) i / (double) n;
    }

    return pFrac;
}

---