# Polygamma function Calculator

## Calculates the Polygamma function Ψn(a). order n -101234 n=-1,0,1,2,3,4 a 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit
Polygamma function
 [1-3] /3 Disp-Num5103050100200  2020/04/12 16:40   - / - / - /
Bug report
Results for polygamma(x) for negative x do not agree with those found elsewhere.

For example, calculating polygamma(-0.9) to 26 digits.

Another source, WolframAlpha, which uses arbitrary precision arithmetic via Mathematica, gives
poylgamma(-0.9) = -9.3126438292999656840571051..., which can be seen here: https://www.wolframalpha.com/input/?i=Digamma%5B-0.9%5D.

The result of this calculator is: polygamma(-0.9) = 10.025012151628085122506559...

Hoping that it is simply a slightly different definition, but I am puzzled because for positive x the calculators agree.

Many thanks.
from Keisan
We've fixed it.
  2017/03/28 09:22   60 years old level or over / High-school/ University/ Grad student / Useful /
Purpose of use
Calculation of the influence of weak localization on electrical resistivity.
Comment/Request
I would like to have digamma calculation (table of data and chart). Could you kindly help me. Thank P. V.
  2009/08/10 10:50   30 level / A researcher / Very /
Purpose of use
Comparison.
Comment/Request
Nice.  Sending completion To improve this 'Polygamma function Calculator', please fill in questionnaire.
Age

Occupation

Useful?

Purpose of use? 