Re: What is causing this error message?

• To: mathgroup at smc.vnet.net
• Subject: [mg57575] Re: [mg57537] What is causing this error message?
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Wed, 1 Jun 2005 06:02:47 -0400 (EDT)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200505310900.FAA03456@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```You have (at least) two errors in the input cell you show:

(1) Presumably you want the terms x y and x y^2 rather than xy and xy^2.
(The latter pair would refer to a two-letter variable "xy".)

(2) You need the double-equal sign == to indicate an equation.  (By
contrast, the single-equals = is used to assign values, which is
shorhand for the Set function.)

Such examples are a good way to learn how Mathematica works, but it's
also a very good idea to do start at the beginning of the part "A
Practical Introduction to Mathematica" to learn such basic syntactical
notions as well as the semantics of them.

> 	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.

--
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

```

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