RE: Re: help with integration and warning message
- To: mathgroup at smc.vnet.net
- Subject: [mg47142] RE: [mg47101] Re: help with integration and warning message
- From: JonasB at iui.se
- Date: Sat, 27 Mar 2004 01:34:48 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
I don't know if this is directly related, but there is a bug filed with 5.x
with local variables in summations and integrations. Mathematica does not
consistently treat iterators as local variables. In the first sum i is a
local variable, in the second it is not:
In[1]:=
i=1;
Sum[i, {i, 1, N}]
Sum[f[i], {i, 1, N}]
Out[1]=
\!\(1\/2\ N\ \((1 + N)\)\)
Out[2]=
N f[1]
Version 4.1 does not have this problem.
Jonas
> -----Original Message-----
> From: astanoff_otez_ceci at yahoo.fr
To: mathgroup at smc.vnet.net
> [mailto:astanoff_otez_ceci at yahoo.fr]
> Sent: den 26 mars 2004 09:56
> To: mathgroup at smc.vnet.net
> Subject: [mg47142] [mg47101] Re: help with integration and warning message
>
>
> Salman Durrani wrote:
>
> > Hi,
>
> > I am running a code which can be downloaded from:-
> > http://www.itee.uq.edu.au/~dsalman/_downloads/Pbtest.nb
>
> > I am getting the warning message, related to the intergal
> defining the
> > symbol [Chi]:
>
> > "Unique::usym : 15 is not a symbol name or a valid symbol name"
>
> > Can anyone please suggest how to correct the script and remove this
> > warning.
>
> Don't use 'K'.
> K is a generic index name used by Mathematica.
> Names that start with a capital letter may conflict with
> built-in Mathematica
> names...
> --
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