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Re: What is going on!?!

• To: mathgroup at smc.vnet.net
• Subject: [mg104733] Re: What is going on!?!
• From: David Bailey <dave at removedbailey.co.uk>
• Date: Sun, 8 Nov 2009 06:46:44 -0500 (EST)
• References: <hd3ml1$9in$1@smc.vnet.net>

Joe Hays wrote:
> Can anyone tell me why the output is not a simple "10" instead of "10 Null"?
> 
> In[3]:= x = 0;
> For[i = 1, i <= 10, i++,
>   x = x + 1;
>   ] x
> 
> Out[4]= 10 Null
> 
> 
Your For function returns Null, and this is getting multiplied by x 
because you forgot the semicolon after the ] .

David Bailey
http://www.dbaileyconsultancy.co.uk