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Re: What is going on!?!

• To: mathgroup at smc.vnet.net
• Subject: [mg104737] Re: [mg104688] What is going on!?!
• From: Leonid Shifrin <lshifr at gmail.com>
• Date: Sun, 8 Nov 2009 06:47:34 -0500 (EST)
• References: <200911071146.GAA09847@smc.vnet.net>

Joe,

The For loop does not produce any result, that is - it produces Null. The
space is understood as a multiplication operator by the Mathematica parser.
Thus your result. Put a semicolon after the closing bracket of the For  loop
and you will get what you expect.

Regards,
Leonid


On Sat, Nov 7, 2009 at 3:46 AM, Joe Hays <joehays at vt.edu> 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
>
>
>

• References:
  • What is going on!?!
    • From: Joe Hays <joehays@vt.edu>