Re: Bug in Mathematica 8 vs Mathematica 7: SeriesData
- To: mathgroup at smc.vnet.net
- Subject: [mg116832] Re: Bug in Mathematica 8 vs Mathematica 7: SeriesData
- From: Lou <lvveen32 at xs4all.nl>
- Date: Wed, 2 Mar 2011 04:32:08 -0500 (EST)
- References: <ikihg0$7qt$1@smc.vnet.net>
On 1 mrt, 11:24, GidiL <gidiena... at gmail.com> wrote:
> Dear All!
>
> A long time ago I asked about the right way of using SeriesData for
> multiple expansions.
>
> For example, if you want a multiple expansion of a metric in general
> relativity, it is quite simple to input:
> SeriesData[r, Infinity, {-1, -2, -3}, 0, 3, 1]
> In Mathematica 7 this line is accepted as is, without any error
> messages or problems.
>
> Yet, try this in Mathematica 8. You will get the following error
> message:
> SeriesData::sdatv: "First argument 1/r is not a valid variable."
>
> Does anyone know what has changed in version 8? Why should such a
> simple expression be invalid in version 8 but be OK in version 7? I
> find it quite strange.
>
> Would appreciate any help!
>
> Cheerio,
>
> Gideon
I'm Getting in mm8:
In[1]:= SeriesData[r, Infinity, {-1, -2, -3}, 0, 3, 1]
-1-2/r-3/r^2+O[1/r]^3
so no problem!
Are you sure you're not using your variable r somewhere else?
Kind regards,
Lou