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Re: Is this a bug?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90855] Re: Is this a bug?
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Sat, 26 Jul 2008 04:22:48 -0400 (EDT)

On 7/25/08 at 6:14 AM, mailcwc at gmail.com wrote:

>I tried to solve the following equation with mathematica 6.03

>Solve[{Abs[X+Y I]==5,X==3},{X,Y}]

>and got the answer

>{{X -> 3, Y -> -2 I}, {X -> 3, Y -> 8 I}}

This is correct since

3 + (-2 I) I = 3 + 2 = 5 and
3 + (8 I) I = 3 - 8 = -5

>Am I  suppose to get {{X -> 3, Y -> 4 I}, {X -> 3, Y -> -4 I}}

This would be incorrect. I suspect you wanted real values for x
and y such as obtained from

In[14]:= Solve[{Sqrt[x^2 + y^2] == 5, x == 3}, {x, y}]

Out[14]= {{y->-4,x->3},{y->4,x->3}}


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