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Groups > comp.soft-sys.math.mathematica > #3133
| From | DrMajorBob <btreat1@austin.rr.com> |
|---|---|
| Newsgroups | comp.soft-sys.math.mathematica |
| Subject | Re: saddlepoint approx, solving a sum |
| Date | 2011-06-17 04:07 +0000 |
| Organization | Steven M. Christensen and Associates, Inc and MathTensor, Inc. |
| Message-ID | <iteju3$s2e$1@smc.vnet.net> (permalink) |
| References | <201106160800.EAA13170@smc.vnet.net> |
Show us your Solve statement. Otherwise, we're guessing.
Bobby
On Thu, 16 Jun 2011 03:00:10 -0500, gideonmath
<g.s.j.cramwinckel@students.uu.nl> wrote:
> For a saddlepoint approximation i need to solve the following equation:
> K'[t]==y^*,t
>
> K[t_]:= Sum[Log[1-p[i]+p[i]Exp[c[i]t]], {i,1,n}]
> where p[i] denotes a probability (hence all p[i] in (0,1) and \sum
> p_i=1. Same holds for the c[i], but c[i], p[i] all independent.
>
> Solve works for a 1-term Sum, but for 2 or more terms I get this error:
> Solve::nsmet: This system cannot be solved with the methods available to
> Solve. >>
>
> Why does the method fail? I suppose that it has to do something with the
> log[..+...] kind of terms.
> IS there a workaround?
>
--
DrMajorBob@yahoo.com
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Re: saddlepoint approx, solving a sum DrMajorBob <btreat1@austin.rr.com> - 2011-06-17 04:07 +0000
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