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MathGroup Archive 2002

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RE: HoldForm Obscurities

  • To: mathgroup at smc.vnet.net
  • Subject: [mg33979] RE: [mg33945] HoldForm Obscurities
  • From: "Wolf, Hartmut" <Hartmut.Wolf at t-systems.com>
  • Date: Thu, 25 Apr 2002 02:59:53 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

> -----Original Message-----
> From: Dustin Vink [mailto:d.vink at mech.gla.ac.uk]
To: mathgroup at smc.vnet.net
> Sent: Wednesday, April 24, 2002 7:22 AM
> To: mathgroup at smc.vnet.net
> Subject: [mg33979] [mg33945] HoldForm Obscurities
> 
> 
> Dear Reader,
> 
> Can someone explain the following obscurity?
> 
> In: HoldForm[Times[1, 1, 2, 2]]
> 
> Out: 2 2
> 
> In: HoldForm[Times[1, 1, 2, 1]]
> 
> Out: 1 1 2 1
> 
> In: HoldForm[Times[1, 1, 2]]
> 
> Out: 1 1 2
> 
> In: HoldForm[Times[2, 1, 2]]
> 
> Out: 2 2
> 
> 
> Dustin ~:(
> 
> 

Dustin,

this observation of you has nothing to do with HoldForm (or Hold, showing
the same phenomenon). This already happens when Mathematica input is parsed
to form an expression. See

In[14]:= MakeExpression["1 1 2 2"]
Out[14]= HoldComplete[2 2]

Some transformations are already made when reading input (to ease the
interpreter). Another example would be

In[15]:= MakeExpression["2^^1011"]
Out[15]= HoldComplete[11]

So here some 1-s are (occasionally) skipped at Times. No harm is done with
this. I don't know what you like to achieve, perhaps better manipulate
strings.

--
Hartmut



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