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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
> 
> 


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