MathGroup Archive 2005

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: question about HoldForm


On 28 Sep 2005, at 16:14, Andrzej Kozlowski wrote:

>
> On 28 Sep 2005, at 14:41, Ruth Lazkoz wrote:
>
>
>>
>> Hi,
>>
>> I have this expression
>>
>> x = 2; HoldForm[x^2 + 4x + 4]
>>
>> Is there a way to operate on HoldForm so that I get (x^2+2)^2? If  
>> I cut
>> a paste the result and operate on it I obviously get 16.
>>
>> Thanks,
>>
>> Ruth
>>
>>
>>
>>
>
> Do you mean (x+2)^2?
> Assuming so one possible way is something like this:
>
>
> x = 2; v = HoldForm[x^2 + 4*x + 4];
>
>
> Block[{x}, HoldForm[Evaluate[v /. HoldForm[u_] :> Factor[u]]]]
>
>
> HoldForm[(x + 2)^2]
>
> Andrzej Kozlowski
>
>
>


This may be slightly simpler, though the idea is the same.



x = 2; v = HoldForm[x^2 + 4*x + 4];

In[3]:=
Block[{x}, HoldForm[Evaluate[Factor[ReleaseHold[v]]]]]


HoldForm[(x + 2)^2]

Andrzej Kozlowski


  • Prev by Date: Re: question about HoldForm
  • Next by Date: Re: what is wrong with this plot?
  • Previous by thread: Re: question about HoldForm
  • Next by thread: Re: Re: question about HoldForm