Example usage for org.apache.commons.math.linear RealMatrix getTrace

Introduction

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

Prototype

double getTrace() throws NonSquareMatrixException;

Source Link

Document

Returns the <a href="http://mathworld.wolfram.com/MatrixTrace.html"> trace</a> of the matrix (the sum of the elements on the main diagonal).

Usage

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

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

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