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MathGroup Archive 1997

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NSolve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg8558] NSolve
  • From: " (Fred Lang)" <lang at einev.ch>
  • Date: Sat, 6 Sep 1997 23:16:23 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Dear Mathgroupers,

I've found something strange with NSolve in Mma 3.0 (PC and MAC).

Try the following input:

In[1] =  NSolve[ x^2 + x(z+1) == 0 , x]

Out[1] = {{x -> -1.},{x -> 0.}}

In[2] =  NSolve[x^2 + x z + x == 0 , x]

Out[2] = {{x -> 0.},{x -> -1. - 1.z }}

The first output is wrong. NSolve has choosen for me to put z = 0.

OK! NSolve is a numerical command and z has no numerical value, but

why don't NSolve give me something like "No numerical value for z, I put z
= 0" ?

In Mma 2.2, NSolve gives the correct answer.

Thank you for your remarks.

Cheers.

Fred Lang




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