> I have got a question about Streaming Expression evaluators.
> I would like to calculate mean, standard deviation and variance of the
> given array.
> For example, the following code works for the mean:
> let(arr=array(1,3,3), m=mean(a))
> Also, I want to compute variance and standard deviation as well i.e.:
> let(echo="m,v,sd", arr=array(1,3,3), m=mean(a), v=var(a),
> It seems the var(), stddev() evaluator functions are not implemented as
> separate functions??