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