Re: evaluate f[{x,y,z}] when f[x,y,z] defined
- To: mathgroup at smc.vnet.net
- Subject: [mg103392] Re: [mg103383] evaluate f[{x,y,z}] when f[x,y,z] defined
- From: Patrick Scheibe <pscheibe at trm.uni-leipzig.de>
- Date: Sun, 20 Sep 2009 06:19:40 -0400 (EDT)
- References: <200909190926.FAA22303@smc.vnet.net>
Hi, just replace the List head of {1,2,3} by Sequence head. f[x_, y_, z_] := Sqrt[x^2 + y^2 + z^2]; a = {1, 2, 3}; f[Sequence @@ a] Cheers Patrick On Sat, 2009-09-19 at 05:26 -0400, Murray Eisenberg wrote: > I ought to know how to do this (simply) but don't, or at least don't > recall how... > > Often I have a function of several variables defined, for example: > > f[x_, y_, z_] := Sqrt[x^2 + y^2 + z^2] > > And I have some list of numbers, e.g.: > > a = {4, 3, 2}; > > How can I evaluate the following... > > f[a] > > ... without having to make a separate definition such as > > f[{x_, y_, z_}] := f[x, y,z] > > ? >
- References:
- evaluate f[{x,y,z}] when f[x,y,z] defined
- From: Murray Eisenberg <murray@math.umass.edu>
- evaluate f[{x,y,z}] when f[x,y,z] defined