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MathGroup Archive 1993

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Re: Hold/Evaluate in Integrate

  • To: mathgroup at
  • Subject: Re: Hold/Evaluate in Integrate
  • From: Richard Mercer <richard at>
  • Date: Fri, 10 Dec 1993 16:41:13 -0500

 >  Can anyone tell me why

>  Hold[Integrate[Evaluate[x+x], x]]

>  returns

>  Hold[Integrate[Evaluate[x+x],x]]

>  not Hold[Integrate[2x, x]]?

>  I want to force evaluation of the arguments to Integrate
>  but not evaluate the integral.

>  Thanks in advance.

>  Daryl (dreece at

No mystery here. Hold[] prevents anything from going on inside it.

My guess is you want 

Integrate[Hold[Evaluate[x+x]], x], which returns
Integrate[Hold[2x], x].

Richard Mercer

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