Prolate spheroidal radial function of the first kind and its derivative
Computes the prolate spheroidal radial function of the first kind
and its derivative (with respect to x) for mode parameters m>=0
and n>=m, spheroidal parameter c and
|x| < 1.0.
This tells me that x is the independent variable and that it is between -1.0 and +1.0. But,
this is not the case. When I put x between 0.0 and 1.0 for example, the output is NaN.
Also, I would like to know what are m and n. It is not clearly defined. I need to know which
one is the order.