I am looking for an exponential integral function different from the function En(x) provided by the full development system of LabVIEW.
I need the integral of (exp(t)/t) dt from -inf to x, where x is nonnegative. I think there might be a way to get this from En(x) if x is allowed to be negative, but that is not allowed in the provided function.
I could do a numerical integration, but prefer a standard function.
Thanks
- John
