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Re: Strange Solve result after previous bad input

  • To: mathgroup at smc.vnet.net
  • Subject: [mg100956] Re: Strange Solve result after previous bad input
  • From: Pillsy <pillsbury at gmail.com>
  • Date: Thu, 18 Jun 2009 20:46:47 -0400 (EDT)
  • References: <h1d4ao$o0q$1@smc.vnet.net>

On Jun 18, 6:19 am, Alain Cochard <al... at geophysik.uni-muenchen.de>
wrote:
[...]
> Here, there is '=' instead of '==' in the 2nd eq:

>      In[2]:= Solve[{a==x + y, b=-x + y},{x,y}]

>      Solve::eqf: -x + y is not a well-formed equation.
[...]
> Is this normal?  

Yes. Here, because you used "=" where you meant to use "==", you've
assigned the value -x + y to the variable b.

> If so, is there a cure (some "resetting" procedure), apart from
> quiting Mathematica and entering back?

Yes, Unset b, like so:

b = .

Cheers,
Pillsy


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