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MathGroup Archive 2007

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Re: HoldForm

  • To: mathgroup at smc.vnet.net
  • Subject: [mg76007] Re: HoldForm
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Mon, 14 May 2007 05:52:07 -0400 (EDT)
  • Organization: University of Bergen
  • References: <f294ia$mpg$1@smc.vnet.net>

dimitris wrote:
> May be I will annoy a little Roman (I am just kiddin'!)
> but I have one question about HoldForm (and yes I am
> obsessed with it! No kiddin'! It's amazing!)
> 
> I have
> 
> In[19]:=
> f[x_] = Log[x]*x;
> lowerLim = 0; upperLim = Pi;
> 
> Then
> 
> In[20]:=
> o = HoldForm[Integrate[f[x], {x, lowerLim, upperLim}]]
> 
> Out[20]=
> HoldForm[Integrate[f[x], {x, lowerLim, upperLim}]]
> 
> However I want the output of Input[20] to be as Out[28]...
> 
> In[28]:=
> HoldForm[Integrate[Log[x]*x, {x, 0, Pi}]]
> 
> Out[28]=
> HoldForm[Integrate[Log[x]*x, {x, 0, Pi}]]
> 
> Any ideas???
> 
> Thanks a lot!
> 
> Dimitris

You can use replace rules to change a held expression:

o /. DownValues[f] /. OwnValues[upperLim] /. OwnValues[lowerLim]

You cannot make this happen automatically because you want to treat 
symbols differently: evaluate f, upperLim and lowerLim, but not 
Integrate. You have to tell Mathematica which are those symbols that you 
want to change.


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