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