def Erf(h, tag=None):
assert h > <NUM_LIT:0>, '<STR_LIT>'<EOL>return Normal(<NUM_LIT:0>, <NUM_LIT:1> / (h * <NUM_LIT:2> ** <NUM_LIT:0.5>), tag)<EOL>
An Error Function random variate. 

This distribution is derived from a normal distribution by setting 
m = 0 and s = 1/(h*sqrt(2)), and thus is used in similar situations 
as the normal distribution.

Parameters
----------
h : scalar
    The scale parameter.