Re: using predefined expressions in functions [newbie
- To: mathgroup at smc.vnet.net
- Subject: [mg100211] Re: [mg100167] using predefined expressions in functions [newbie
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 28 May 2009 04:28:50 -0400 (EDT)
- Reply-to: hanlonr at cox.net
R1 := {x1, y1, z1}
R2 := {x2, y2, z2}
Don' t use SetDelayed in definition of f
f[x1_, y1_, z1_, x2_, y2_, z2_] = R1.R2;
f[1, 2, 3, 4, 5, 6]
32
Bob Hanlon
---- ChangMo <nichthierwohne at gmail.com> wrote:
=============
Hi,
I've been trying to write a function using some predefined
expressions, but the function assignment seems to understand the
symbols in the expressions as literals. eg.,
Needs["VectorAnalysis`"]
R1 := {x1,y1,z1}
R2 := {x2,y2,z2}
f[x1_,y1_,z1_,x2_,y2_,z2_] := R1 . R2
f[1,2,3,4,5,6]
gives the output
x1 x2 + y1 y2 + z1 z2
instead of
32 ( = 1*4 + 2*5 + 3*6 )
Can anyone help me with this? Thanks for your attention.
-ChangMo