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
manipulations. See

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

HTH,
-- Jean-Marc

```

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