Example usage for org.apache.commons.math.linear LUDecomposition getDeterminant

Introduction

In this page you can find the example usage for org.apache.commons.math.linear LUDecomposition getDeterminant.

Prototype

double getDeterminant();

Source Link

Document

Return the determinant of the matrix

Usage

From source file:com.opengamma.analytics.math.linearalgebra.LUDecompositionCommonsResult.java

/**
 * @param lu The result of the LU decomposition, not null. $\mathbf{L}$ cannot be singular.
 *///from  w  w  w  .  j a va2 s. c o m
public LUDecompositionCommonsResult(final LUDecomposition lu) {
    Validate.notNull(lu, "LU decomposition");
    Validate.notNull(lu.getL(), "Matrix is singular; could not perform LU decomposition");
    _determinant = lu.getDeterminant();
    _l = CommonsMathWrapper.unwrap(lu.getL());
    _p = CommonsMathWrapper.unwrap(lu.getP());
    _pivot = lu.getPivot();
    _solver = lu.getSolver();
    _u = CommonsMathWrapper.unwrap(lu.getU());
}

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From source file:com.opengamma.analytics.math.matrix.CommonsMatrixAlgebra.java

/**
 * {@inheritDoc}/* w  w  w . j a v a 2s .c o m*/
 */
@Override
public double getDeterminant(final Matrix<?> m) {
    Validate.notNull(m, "m");
    if (m instanceof DoubleMatrix2D) {
        final RealMatrix temp = CommonsMathWrapper.wrap((DoubleMatrix2D) m);
        final LUDecomposition lud = new LUDecompositionImpl(temp);
        return lud.getDeterminant();
    }
    throw new IllegalArgumentException("Can only find determinant of DoubleMatrix2D; have " + m.getClass());
}

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