[BUG] weird Zeta function
01-12-2014, 10:38 PM (This post was last modified: 01-13-2014 01:40 PM by Tugdual.)
Post: #1
 Tugdual Senior Member Posts: 764 Joined: Dec 2013
[BUG] weird Zeta function
Zeta(3) returns... Zeta(3). I tried Eval, no luck.
So I decided to define F1(X)=Zeta(X) but it doesn't help since F1(3) also returns Zeta(3).
I plotted F1 and then I see the curve on screen. Using the touch screen, menu, I tried "go to" and "3" "Enter". Now I got an error message: function is not defined for x=3.
I tried a manual approximation and entered sum(n^ -3,n,1,1000) which returns 1.20 which is close enough and consistent with what I see on the curve.
So why zeta(3) fails?

Also the zeta help says that Re(x) shall be >1 while zeta returns values for negative x?
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 Messages In This Thread [BUG] weird Zeta function - Tugdual - 01-12-2014 10:38 PM RE: weird Zeta function - Mark Hardman - 01-12-2014, 10:55 PM RE: weird Zeta function - Tugdual - 01-13-2014, 06:55 AM RE: [BUG] weird Zeta function - Joe Horn - 01-13-2014, 07:51 PM RE: [BUG] weird Zeta function - Tugdual - 01-13-2014, 09:48 PM RE: [BUG] weird Zeta function - Joe Horn - 01-16-2014, 07:23 PM RE: [BUG] weird Zeta function - Helge Gabert - 01-13-2014, 04:58 PM RE: [BUG] weird Zeta function - Curlytop - 01-17-2014, 09:33 PM RE: [BUG] weird Zeta function - parisse - 01-18-2014, 07:17 AM RE: [BUG] weird Zeta function - Curlytop - 01-18-2014, 11:01 AM RE: [BUG] weird Zeta function - Tugdual - 01-19-2014, 01:16 PM

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