Re: evaluate f[{x,y,z}] when f[x,y,z] defined
- To: mathgroup at smc.vnet.net
- Subject: [mg103410] Re: [mg103383] evaluate f[{x,y,z}] when f[x,y,z] defined
- From: Murray Eisenberg <murray at math.umass.edu>
- Date: Sun, 20 Sep 2009 06:24:45 -0400 (EDT)
- Organization: Mathematics & Statistics, Univ. of Mass./Amherst
- References: <200909190926.FAA22303@smc.vnet.net> <1253355696.5955.0.camel@localhost>
- Reply-to: murray at math.umass.edu
Of course! (I was trying f[Sequence[a]] .) Thanks. Patrick Scheibe wrote: > 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] >> >> ? >> > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305
- 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