RE: How to change the argument of a function?
- To: mathgroup@smc.vnet.net
- Subject: [mg10832] RE: [mg10783] How to change the argument of a function?
- From: Jean-Marie THOMAS <jmthomas@cybercable.tm.fr>
- Date: Tue, 10 Feb 1998 21:01:44 -0500
- Return-Receipt-To: Jean-Marie THOMAS <jmthomas@cybercable.tm.fr>
Try:
f[x_]:=x+1;
and set the new value for x:
x=f[x]
Comment: is it the old problem in Pascal or C: passing a parameter by
address or by value? I am not sure of this, but I feel Mathematica
copies all the input parameters, but keeps for these the same name.
Hope this helps,
-----------------------------------------------
Jean-Marie THOMAS
Conseil et Audit en Ingenierie de Calcul jmthomas@cybercable.tm.fr
+33 (0)3 88 32 93 64
www.cybercable.tm.fr/~jmthomas
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-----Message d'origine-----
De: Vilis Nams [SMTP:vnams@nsac.ns.ca] Date: jeudi 5 fevrier 1998 06:58
A: mathgroup@smc.vnet.net
Objet: [mg10783] How to change the argument of a function?
I want to define a function that in the course of doing something, also
changes the value of its argument, for example: f[x_]:=Module[{},
x=2*x;
x
]
When I run the function, I get the error: "Set::setraw : Cannot assign
to raw object ...." Can this be done in some way?
--------------------
Vilis O. Nams
Dept of Biology, NSAC
Box 550, Truro, NS, Canada
vnams @ nsac.ns.ca
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