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MathGroup Archive 2005

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Re: Question regarding Mathematica's treatment of whitespace

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61845] Re: [mg61795] Question regarding Mathematica's treatment of whitespace
  • From: Igor Antonio <igora at wolf-ram.com>
  • Date: Tue, 1 Nov 2005 00:39:39 -0500 (EST)
  • Organization: Wolfram Research, Inc.
  • References: <200510300443.AAA09795@smc.vnet.net>
  • Reply-to: igora at wolf-ram.com
  • Sender: owner-wri-mathgroup at wolfram.com

Matt wrote:
> Hello,
>   It seems that most of the time Mathematica ignores whitespace.  e.g. all of
> the following evaluate with no problem:
> 
> Sin    [
> Pi/2
> ]
> 
> 
> Sin    [
> 
> 
> 
> Pi/2
> 
> 
> 
> ]
> 
> 
> However,
> 
> Sin
> [Pi/2]
> 
> does not.  Is that just the way it is?  The reason I ask, is because I
> would like to be able to use brackets '[,]' as I do braces in C/C++ to
> help show the 'flow' of logic (within larger functions obviously), but
> obviously Module[] doesn't work if it sees a cr/lf before the opening
> bracket.
> 
> Thanks,
> 
> Matt


You're correct that Mathematica ignores most whitespaces, but Mathematica will 
treat different lines as different expressions, unless there are 
brackets/parentheses/curly braces/operators/etc that indicate that the content 
continues on the next line.

Here's a similar example:

In[13]:= 1 +
          1

Out[13]= 2

In[14]:= 1
          +1

Out[14]= 1

Out[15]= 1

You have to have something that indicates the expression is not complete on the 
current line.  In your case, you'll have to use the brackets.  The way I write 
to show the "flow" of logic is:

f[x_] := Module[{},
   ...
]

or sometimes

f[x_] :=
   Module[{},
   ...
]

(if I want the name of the function on its own line)

When "looking" at the code, I can quickly match the closing bracket of Module 
with the function f.
-- 


Igor C. Antonio
Wolfram Research, Inc.
http://www.wolfram.com

To email me personally, remove the dash.


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