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MathGroup Archive 1999

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Q: How to take an expr from Hold[expr] wrap without evaluate it?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg19271] Q: How to take an expr from Hold[expr] wrap without evaluate it?
  • From: xingjing at calvin.math.vt.edu (X. Jing Li)
  • Date: Thu, 12 Aug 1999 01:24:25 -0400
  • Organization: The Math Forum
  • Sender: owner-wri-mathgroup at wolfram.com

Hi, 

I have an expression variable wrapped in the Hold or HoldComplete
function such as

expr = HoldComplete[Sin[x]\[DifferentialD]x]]

where Sin[x]\[DifferentialD]x is a sympolic expression variable. How
can I take the it out without evaluate it? I have tried the

Expr = ReleaseHold[Unevaluated[ expr]]
or
Expr = FullSimplify[ expr]
and so on without success. All I wanted is the simple symbolic
expression.

Thanks in advance. Any help is greatly appreciated.

X.Jing


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