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MathGroup Archive 2006

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Re: How can I use multiple filename ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg67022] Re: How can I use multiple filename ?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Wed, 7 Jun 2006 05:09:38 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <e63mff$knj$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

bar at ANTYSPAM.ap.krakow.pl wrote:
> Hi , 
>  When I try :
> For[i=1,i<10,
>     name="a"<>ToString[i];
>     i>>name;
>     i++];
> 
> it doesn'w work
> 
> Could  You help me ?
> 

It works indeed; although not in the way you may have expected: the 
symbol "name" is not evaluated to its value; therefore Mathematica 
writes in a file called "name" rather than "a1", or "a2", etc.

In[1]:=
For[i = 1, i < 10, name = StringJoin["a", ToString[i]]; i >> "name"; i++];

In[2]:=
!!a1

 From In[2]:=
General::noopen :  Cannot open a1. More...

In[3]:=
!!name

 From In[3]:=
9

The following expressions will do what you want.

In[4]:=
Clear[a, b, c]

In[5]:=
For[i = 1, i < 10, name = StringJoin["a", ToString[i]];
     Put[i + a, Evaluate[name]]; i++];

In[6]:=
!!a1

 From In[6]:=
1 + a

In[7]:=
For[i = 1, i < 10, Put[i + b, Evaluate[StringJoin["a", ToString[i]]]];
i++];

In[8]:=
!!a5

 From In[8]:=
5 + b

This one is even more C-like:

In[9]:=
For[i = 1, i < 10, Put[i + c, Evaluate[StringJoin["a", ToString[i++]]]]; ];

In[10]:=
!!a9

 From In[10]:=
9 + c

Best regards,
Jean-Marc


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