[math] RandomData: Zero variance in Gaussian distribution?

[Paul Doyle <pa...@traventec.com>]

The RandomData interface stipulates that the standard deviation value for a call to nextGaussian(double mu, double sigma) should be greater than zero.  Can anybody explain to me why this restriction exists?

I would like to use a range of standard deviation values, including at times a value of zero resulting in a return value equal to the specified mean value.  The above restriction prevents this.  I can work around this easily enough but now I'm wondering if there is a good reason not to do so.

Thanks in advance -

Paul

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