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Re: Series expansion question


gts[a, b] /. {a -> x0 + z, b -> y0 + z}


Bob Hanlon

On Sun, Nov 6, 2011 at 5:56 AM, Recif <recif at yahoo.com> wrote:
> I defined a function:
> gts[x_, y_] := Normal[Series[g[x, y], {x, x0, 1}, {y, y0, 1}]]
>
> and when I use it with 'a' and 'b' undefined, I get the value I expect:
> gts[a, b]
> g[x0,y0] + (a-x0) g^(1,0)[x0,y0] + (b-y0) g^(0,1)[x0,y0] ...
>
> However when I assign values to a and b:
> a = x0 + z
> b = y0 + z
>
> gts[a,b]
> gives me an error:
> General::ivar: "x0+z is not a valid variable"
>
> etc.
>
> I would appreciate any help to fix this.
> Thanks.
> Recif
>



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