Example usage for org.apache.commons.math.linear RealVector getLInfNorm

Introduction

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

Prototype

double getLInfNorm();

Source Link

Document

Returns the L_∞ norm of the vector.

Usage

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

/**
 * {@inheritDoc}/*from   w  w w .j  a v  a 2  s .  c  o m*/
 */
@Override
public double getNormInfinity(final Matrix<?> m) {
    Validate.notNull(m, "m");
    if (m instanceof DoubleMatrix1D) {
        final RealVector temp = CommonsMathWrapper.wrap((DoubleMatrix1D) m);
        return temp.getLInfNorm();
    } else if (m instanceof DoubleMatrix2D) {
        final RealMatrix temp = CommonsMathWrapper.wrap((DoubleMatrix2D) m);
        //REVIEW Commons getNorm() is wrong - it returns the column norm
        // TODO find if commons implements this anywhere, so we are not doing it
        // by hand
        double max = 0.0;
        for (int row = temp.getRowDimension() - 1; row >= 0; row--) {
            max = Math.max(max, temp.getRowVector(row).getL1Norm());
        }
        return max;
    }
    throw new IllegalArgumentException("Can only find normInfinity of DoubleMatrix2D; have " + m.getClass());
}

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