Re: Annoying error in Hypergeometric2F1
- To: mathgroup at smc.vnet.net
- Subject: [mg107905] Re: [mg107888] Annoying error in Hypergeometric2F1
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Tue, 2 Mar 2010 07:53:43 -0500 (EST)
- Reply-to: hanlonr at cox.net
$Version
7.0 for Mac OS X x86 (64-bit) (February 19, 2009)
Hypergeometric2F1[1/2, 2, 3/2, -125/100]
(1/45)*(10 + 9*Sqrt[5]*
ArcTan[Sqrt[5]/2])
% // N
0.59836
Hypergeometric2F1[1/2, 2, 3/2, -1.25]
0.59836
Hypergeometric2F1[1/2, 2, 3/2, -125/100] -
Hypergeometric2F1[1/2, 2, 3/2, -1.25]
-1.1102230246251565*^-16
Bob Hanlon
---- anguzman at ing.uchile.cl wrote:
=============
This is very bad and disappointing...what about version 7 ..
Looks like the symbolic evaluation is messed up..
Mathematica 6.0 for Linux x86 (32-bit)
Copyright 1988-2008 Wolfram Research, Inc.
In[1]:= Hypergeometric2F1[1/2, 2, 3/2, -125/100]
Sqrt[5]
10 + 9 Sqrt[5] ArcTanh[-------]
2
Out[1]= -------------------------------
45
In[2]:= %//N
Out[2]= 0.867836 - 0.702481 I
In[3]:= Hypergeometric2F1[1/2, 2, 3/2, -1.25]
Out[3]= 0.59836
Atte. Andres Guzman