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using predefined expressions in functions [newbie question]

• To: mathgroup at smc.vnet.net
• Subject: [mg100167] using predefined expressions in functions [newbie question]
• From: ChangMo <nichthierwohne at gmail.com>
• Date: Wed, 27 May 2009 04:05:31 -0400 (EDT)

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

• Follow-Ups:
  • Re: using predefined expressions in functions [newbie
    • From: Leonid Shifrin <lshifr@gmail.com>