public double magnitude() {
        // Check whether the current magnitude is valid and if not, recompute it
        if (magnitude < 0) {
            magnitude = 0;
            for (int nz : getNonZeroIndices()) {
                double d = vector.get(nz).doubleValue();
                magnitude += d * d;
            }
            magnitude = Math.sqrt(magnitude);
        }
        return magnitude;
    }
public double magnitude ( ) { if ( magnitude < 0 ) { magnitude = 0 ; for ( int nz : getNonZeroIndices ( ) ) { double d = vector . get ( nz ) . doubleValue ( ) ; magnitude += d * d ; } magnitude = Math . sqrt ( magnitude ) ; } return magnitude ; }
{@inheritDoc}