public void setSigma(double sigma)
    {
        if(sigma <= 0 || Double.isNaN(sigma) || Double.isInfinite(sigma))
            throw new ArithmeticException("sigma must be positive, not " + sigma);
        this.sigma = sigma;
    }
public void setSigma ( double sigma ) { if ( sigma <= 0 || Double . isNaN ( sigma ) || Double . isInfinite ( sigma ) ) throw new ArithmeticException ( "sigma must be positive, not " + sigma ) ; this . sigma = sigma ; }
Sets the sigma parameter value, which controls the width of the kernel
@param sigma the positive parameter value