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Re: NEWBIE: How do I use the results of a Solve?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg95989] Re: [mg95963] NEWBIE: How do I use the results of a Solve?
*From*: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
*Date*: Sat, 31 Jan 2009 06:43:39 -0500 (EST)
*References*: <200901310611.BAA28347@smc.vnet.net>
Like this :
Solve[2*x + 9 == 33, x] /. Rule -> Set
But it's not a good idea, because you will have to delete x later on,
writing Clear[x]...
I would suggest to use Rules like this :
y == x*5 /. Solve[2*x + 9 == 33, x][[1]]
and so no variable will be fixed with a value!
Regards
Jaccard Florian
Rendez-vous le 21 mars 2009, lors de nos portes ouvertes.
-----Message d'origine-----
De : Tim Heger [mailto:timheger at yahoo.com]
Envoy=E9 : samedi, 31. janvier 2009 07:12
=C0 : mathgroup at smc.vnet.net
Objet : [mg95963] NEWBIE: How do I use the results of a Solve?
I can't figure out how to use the results of Solve I just created as a new
variable.
Here's a simple example of what I am trying to do:
Solve[some equation, x]
Results in {x->12}
I then want to use the x in y = x * 5 for example....
Obviously when I try to use this it fails because Mathematica sees the
equation as y = {x->12} * 5 and not y = 12 *5 ...
How do I change the results from the Solve from a rule to an actual value I
can then use?
Thanks,
Tim
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