Thanks Simon, How do I write symbolic expressions like that.
Regards
On 8 February 2013 00:12, Simon King <simon.k...@uni-jena.de> wrote:
> Hi!
>
> On 2013-02-07, Olajumoke Yetunde Fashomi <yetu...@aims.ac.za> wrote:
> > Thanks for your concern, F is a function of y which are the non-linear
> > terms in the second order initial value problem. The purpose of the y[n]
> is
> > to generate a recursive relation for the polynomials
>
> I think John was not asking how F is defined mathematically, but how F
> was defined in your Sage session. Namely, the code snippet you provided
> does not contain a definition of F and would thus simple yield a
> NameError.
>
> > On 7 February 2013 21:16, john_perry_usm <john.pe...@usm.edu> wrote:
> >> Out of curiosity, how is F defined?
> >>
> >> I don't know if this is the cause, but when I try something similar, I
> > get a
> >> problem with y[n]: 'sage.symbolic.expression.Expression' does not
> support
> >> indexing. Since it's a different error, you're probably encountering
> >> something else.
>
> I suppose John tested something like the following.
> sage: var('y')
> y
> sage: y[1]
>
> ---------------------------------------------------------------------------
> TypeError Traceback (most recent call
> last)
> <ipython-input-3-c3672a1efa28> in <module>()
> ----> 1 y[Integer(1)]
>
> TypeError: 'sage.symbolic.expression.Expression' object does not
> support indexing
>
> Hence, as you see, one gets an error message that differs from what you
> reported.
> That said, it is rather likely that y[n] is the problematic spot in your
> code,
> because symbolic expressions simply don't support that syntax.
>
> Best regards,
> Simon
>
> --
> You received this message because you are subscribed to the Google Groups
> "sage-support" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to sage-support+unsubscr...@googlegroups.com.
> To post to this group, send email to sage-support@googlegroups.com.
> Visit this group at http://groups.google.com/group/sage-support?hl=en.
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
--
*Fashomi, Olajumoke Yetunde
African Institute for Mathematical Sciences (AIMS),
6 Melrose Road,
Muizenberg, 7945,
Cape Town, South Africa
email:feuniceyetu...@yahoo.com.
+27 784846917
*****
*
*
--
You received this message because you are subscribed to the Google Groups
"sage-support" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to sage-support+unsubscr...@googlegroups.com.
To post to this group, send email to sage-support@googlegroups.com.
Visit this group at http://groups.google.com/group/sage-support?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
