topic Re: Field Calculator Null Values in Python Questions

Field Calculator Null Values

OswaldoBarrera_Martin — Wed, 07 Aug 2013 11:02:52 GMT

Hi

I am trying to calculate the incomplete gamma function using Python. For now, the only way that I have found to do this is by using the library "mpmath". Particularly, the "mpmath.gammainc" function works perfectly in the Python window but when I try to implement this function in the field calculator it gives "Null" values.

This is the code I am using:

def H(a):
import mpmath
b=mpmath.gammainc(a,0)
return b

Is there any solution for solving this problem? Is there any alternative method for calculating the incomplete gamma function?

Many thanks in advance

Oswaldo

Re: Field Calculator Null Values

JimCousins — Wed, 07 Aug 2013 13:45:47 GMT

Do you have a correct field type to receive the output?

Re: Field Calculator Null Values

DanPatterson_Retired — Wed, 07 Aug 2013 13:50:04 GMT

See Distributions.py on our ArcGIS Online site
http://carleton-u.maps.arcgis.com/home/item.html?id=076912624eaa4043bb46ef5068e12626

Re: Field Calculator Null Values

OswaldoBarrera_Martin — Wed, 07 Aug 2013 15:09:10 GMT

Do you have a correct field type to receive the output?

I have tried with Float, Double and integers. In all the cases, the "null" value was the output

thanks