Mathematica 9 is now available
Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: how to get rid of extra parentheses ?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92523] Re: how to get rid of extra parentheses ?
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Thu, 2 Oct 2008 18:48:10 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <gc2167$qa4$1@smc.vnet.net>

Obaid Rehman wrote:

> I am wondering if some one can help me in my issue.
> 
> After some Algebraic manipulation I get the result but it is inside the
> two parenthesis e.g. {{...........  }}. The problem is that Mathematica
> understand it as a list or matrix entry.
> 
> If I need to use this result directly into the matrix manipulation it
> gives the error. Question is how to get rid these extra parentheses in
> the result that Mathematica add itself?
> 
> e.g
> 
> {{cb S V/ 2}}

Being clueless about what algebraic steps you followed and which 
functions you used and/or programmed, it is hard to tell why you get the 
result in the above form. Now, you can manipulate your result as any 
other Mathematica expression, say by using the built-in function *Part* 
(shortcut [[__]]). In your example, what you want is the first entry of 
the first row, so [[1, 1]].

     In[1]:= expr = {{cb S V/2}}

     Out[1]= {{(cb S V)/2}}

     In[2]:= expr[[1, 1]]

     Out[2]= (cb S V)/2

The online documentation on *Part* contains numerous pointers to 
additional information and tutorials about list and expression 
manipulations. See

http://reference.wolfram.com/mathematica/ref/Part.html


HTH,
-- Jean-Marc


  • Prev by Date: Re: how to get rid of extra parentheses ?
  • Next by Date: Re: how to get rid of extra parentheses ?
  • Previous by thread: Re: how to get rid of extra parentheses ?
  • Next by thread: Re: how to get rid of extra parentheses ?