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Re: How to evaluate parts of an expression, but not other parts?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122695] Re: How to evaluate parts of an expression, but not other parts?
  • From: Silvia <wyelen at gmail.com>
  • Date: Sun, 6 Nov 2011 05:56:28 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j930l9$a3d$1@smc.vnet.net>
  • Reply-to: comp.soft-sys.math.mathematica at googlegroups.com

maybe you can use a Rule list to replace a, b, c, d outside the HoldForm. e.g.

HoldForm[(a + b) + (c + d)] /. {a -> Sin[Pi/4]}



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