var, sttdev Streaming Evaluators.

[Nazerke S]

Hi,

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),
sd=stddev(a))

It seems the var(), stddev() evaluator functions are not implemented as
separate functions??

__Nazerke