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Re: Redirecting input

• To: mathgroup at smc.vnet.net
• Subject: [mg92327] Re: Redirecting input
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Sat, 27 Sep 2008 22:21:21 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <gbl2vp$m00$1@smc.vnet.net>

Ignacio Plazeta wrote:
> Dear Friends
> 
> Let, as an example,
> 
>    f[x_] := x + 1
> 
> be a function I have to calculate over and over again;
> it would result useful redirecting input to avoid
> typing
> 
> f[2] Enter
> f[67] Enter
> f[31] Enter
> ....
> 
> and simply make use of
> 
> 2 Enter
> 67 Enter
> 31 Enter
> ....
> 
> Plese, can you point out a trick to perform it ?
> 
> Best Regard
> 
> Ignacio Plazeta

At your own risk (you may have to restart the kernel to work as usual), 
but you could (re)define the global variable *$Pre* so  f would be 
applied to any subsequent entry. For instance,

In[225]:= f[x_] := x + 1

In[226]:= f[2]

Out[226]= 3

In[227]:= $Pre = f[#] &

Out[227]= f[#1] &

In[228]:= 2

Out[228]= 3

In[229]:= 3

Out[229]= 4

Regards,
-- Jean-Marc