Re: NSolve problem
- To: mathgroup at smc.vnet.net
- Subject: [mg59300] Re: [mg59283] NSolve problem
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Fri, 5 Aug 2005 01:21:28 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
Solve[Rationalize[{2 x+3 y==8+I 7,3
x+y==4.99999999999999+7 I,-2 I x+(1+3 I) y==3+5 I}]]
{{x -> 1 + 2*I, y -> 2 + I}}
Bob Hanlon
>
> From: Enrique Zeleny <ezeleny at fcfm.buap.mx>
To: mathgroup at smc.vnet.net
> Date: 2005/08/04 Thu AM 02:08:07 EDT
> Subject: [mg59300] [mg59283] NSolve problem
>
>
>
> Hi
> I f I try to solve these equations
>
> Solve[{2 x + 3 y == 8 + I 7,
> 3 x + y == 5 + 7 I, -2 I x + (1 + 3 I) y == 3 + 5 I}]
>
> the result is
>
> {{x -> 1 + 2*I, y -> 2 + I}}
>
> but if I have
>
> Solve[{2 x + 3 y == 8 + I 7,
> 3 x + y == 4.99999999999999 + 7 I, -2 I x + (1 + 3 I) y == 3 + 5 I}]
>
> gives
>
> \!\(\*FormBox[
> RowBox[{\(RowReduce::"luc"\), \(\(:\)\(\ \)\), "\<\"Result for \
> \\!\\(TraditionalForm\\`RowReduce\\) of badly conditioned matrix \
> \\!\\(TraditionalForm\\`\\((\[NoBreak] \\(\[LeftSkeleton] 1 \
> \[RightSkeleton]\\) \[NoBreak])\\)\\) may contain significant numerical \
> errors. \\!\\(\\*ButtonBox[\\\"More\\\",
> ButtonStyle->\\\"RefGuideLinkText\\\
> \", ButtonFrame->None, ButtonData:>\\\"General::luc\\\"]\\)\"\>"}], \
> TraditionalForm]\)
>
>
> {}
>
>
> I need only an aproximate result, say 5 digits of precission, how can I
> override the NSolve behavior?
>
>
> Thanks in advance
>
>