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Re: Writing to an external file?

• To: mathgroup at smc.vnet.net
• Subject: [mg73376] Re: Writing to an external file?
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Wed, 14 Feb 2007 05:24:11 -0500 (EST)
• Organization: The Open University, Milton Keynes, UK
• References: <eqs9me$io1$1@smc.vnet.net>

laohu wrote:
>  
> 
> When I run the lines below and write the outputs to the the file /trial12/,
> 
>  
> 
> a=11+6
> 
> a>>trial12
> 
> Print ["The answer is ",a]>>>trial12
> 
>  17
> 
>  The answer is  17
> 
>  
> 
>  
> 
> in /trial12/ I get the contents indicated below:
> 
>  
> 
> 17
> 
> Null
> 
>  
> 
> Whenever I write text or text+number combinations, I always get a null 
> string.  Same problem with Export["filename.txt", a].
> 
>  
> 
> Can anyone tell me how to write a Print line or text to an external file?
> 
> 
> 

Manipulating strings directly might achieve what you desire. (In[3] uses 
string concatenation, while In[4] reads the contents of the file from 
within Mathematica.)

In[1]:=
a=11+6

Out[1]=
17

In[2]:=
a>>trial12

In[3]:=
"The answer is "<>ToString[a]>>>trial12

In[4]:=
!!trial12

 From In[4]:=
17
"The answer is 17"

Regards,
Jean-Marc