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MathGroup Archive 2005

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Re: What is causing this error message?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg57559] Re: [mg57537] What is causing this error message?
  • From: "Ingolf Dahl" <ingolf.dahl at telia.com>
  • Date: Wed, 1 Jun 2005 06:01:49 -0400 (EDT)
  • Reply-to: <ingolf.dahl at telia.com>
  • Sender: owner-wri-mathgroup at wolfram.com

By using the Set (=) sign you are trying to set the value of (x^3y + xy -
10) to zero. Mathematica sees this as an attempt to change the rules for
addition, and protests consequently. You should use the Equal sign (==) in
equations.   
Do not forget to put multiplication signs or spaces in relevant places,
where multiplication is intended!

Is this what you mean? 

NSolve[{x^3*y + x*y - 10 == 0, x*y^2 - x*y + 6 == 0}, {x, y}]

Good luck!

Ingolf Dahl
Sweden

-----Original Message-----
From: Bookreader [mailto:bookreader127 at yahoo.com] 
To: mathgroup at smc.vnet.net
Subject: [mg57559] [mg57537] What is causing this error message?

	NSolve[{x^3y + xy - 10 = 0, xy^2 - xy + 6 = 0}, {x, y}]

	Set::write: Tag Plus in -10 + x y + x^3  y is Protected. More.

	Please tell me how to correct this.

	Thanks.




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