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If and ReplaceAll

• To: mathgroup at smc.vnet.net
• Subject: [mg102851] If and ReplaceAll
• From: wiso <gtu2003 at alice.it>
• Date: Sat, 29 Aug 2009 06:33:14 -0400 (EDT)

a = 2c;
ff[z_] := a;
ff[z] /. c -> 1


and I got 2. Ok, now:

a = 2 c;
f[z_] := If[z > 0, a, 0]
f[z] /. c -> 1

and I got:  If[z > 0, a, 0]
but I want: If[z > 0, 2, 0]

I tried to use Evaluate, FullSimplify... but nothing

• Follow-Ups:
  • Re: If and ReplaceAll
    • From: Leonid Shifrin <lshifr@gmail.com>
  • Re: If and ReplaceAll
    • From: "Scot T. Martin" <smartin@seas.harvard.edu>