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NSolve problem

• To: mathgroup at smc.vnet.net
• Subject: [mg59283] NSolve problem
• From: Enrique Zeleny <ezeleny at fcfm.buap.mx>
• Date: Thu, 4 Aug 2005 02:08:07 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

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

• Follow-Ups:
  • Re: NSolve problem
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>