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MathGroup Archive 2001

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Re: Complex Number Simultaneous Equation 2 Unknowns

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31542] Re: Complex Number Simultaneous Equation 2 Unknowns
  • From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
  • Date: Fri, 9 Nov 2001 06:14:00 -0500 (EST)
  • Approved: Steven M. Christensen <steve@smc.vnet.net>, Moderator
  • Organization: Universitaet Leipzig
  • References: <9sdnp2$6gs$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

you have to use Equal[] == and *not* Set[] =
and you have to collect the equations in a List
and

Solve[{((2 + 4\[ImaginaryI])*a) + ((1 + \[ImaginaryI])*b) == (118 + 
          24\[ImaginaryI]), ((1 + \[ImaginaryI])*a) + ((3 +
\[ImaginaryI])*
            b) == 110 + \[ImaginaryI] 0}, {a, b}]

work as expected.

Regards
  Jens

Removethisspamtrap_Martin Evans_ and this one too wrote:
> 
> I've a simultaneous linear equation with complex numbers i'd like to
> put through Mathematica (I'm assuming this is possible!)
> 
> Solve [((2 + 4\[ImaginaryI])*a) + ((1 + \[ImaginaryI])*b) = (118 +
>         24\[ImaginaryI]),
> 
> ((1 + \[ImaginaryI])* a) + ((3 + \[ImaginaryI])*
>           b) = {110 + \[ImaginaryI]0},
> 
> {a, b}]
> 
> (all on one line but split for some sort of clarity here)
> 
> I get this as the output:
> 
> Set::"write": "Tag \!\(Plus\) in \!\(\(\(\(\((2 + \(\(4\\ \
> \[ImaginaryI]\)\))\)\)\\ a\)\) + \(\(\(\((1 + \[ImaginaryI])\)\)\\
> b\)\)\) is \
> Protected."
> 
> Set::"write": "Tag \!\(Plus\) in \!\(\(\(\(\((1 + \[ImaginaryI])\)\)\\
> a\)\) \
> + \(\(\(\((3 + \[ImaginaryI])\)\)\\ b\)\)\) is Protected."
> 
> General::"ivar": "\!\(110 + \[ImaginaryI]0\) is not a valid variable."
> 
> Solve[118 + 24 \[ImaginaryI], {110 + \[ImaginaryI]0}, {a, b}]
> 
> Any ideas as to what i'm doing wrong as the error messages don't make
> it obvious (at least to me as a 4 day old user!!)
> 
> Also I seem to HAVE to use the esc ii esc where i would prefer to use
> lower case J (as an electrical eng) is there something special that
> needs to be done to use lower case J as in the help files it appears
> to be in bold
> 
> --


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