Services & Resources / Wolfram Forums / MathGroup Archive
-----

MathGroup Archive 2013

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

Search the Archive

Re: How to remove external parentheses from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131523] Re: How to remove external parentheses from a list
  • From: Murray Eisenberg <murray at math.umass.edu>
  • Date: Sat, 17 Aug 2013 02:07:23 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • Delivered-to: l-mathgroup@wolfram.com
  • Delivered-to: mathgroup-outx@smc.vnet.net
  • Delivered-to: mathgroup-newsendx@smc.vnet.net
  • References: <20130816110619.E9E426A0D@smc.vnet.net>

One way is to use Sequence with Apply (@@). For example:

   Integrate[x1 + x2^2, Sequence @@ {{x1, a, b}, {x2, c, d}}]

On Aug 16, 2013, at 7:06 AM, Samuel Mark Young <sy81 at sussex.ac.uk> wrote:

>
> Hello,
>
> I'm looking for an easy way to remove the external parentheses from a list.  The list contains integration variables and their respective limits, it currently looks something like this:
>
> {{x1,a,b},{x2,c,d},...,{xn,y,z}}
>
> However, the Integrate (or NIntegrate function) in Mathematica wants me to write it like this:
>
> {x1,a,b},{x2,c,d},...,{xn,y,z}
> i.e. The external parentheses have been removed
>
> I've looked around online and seen suggestions for replacing the curly brackets "{" with a blank space " ", or using Apply (@@) but can't work out the correct syntax.
>
> Thanks for any help and advice!
>
> Regards,
> Sam
>

---
Murray Eisenberg                                    
murray at math.umass.edu
Mathematics & Statistics Dept.      
Lederle Graduate Research Tower           
University of Massachusetts 
710 North Pleasant Street  
Amherst, MA 01003-9305







  • Prev by Date: Re: fyi, making animation into PDF file from images genenerated by Mathematica
  • Next by Date: Re: How to remove external parentheses from a list
  • Previous by thread: How to remove external parentheses from a list
  • Next by thread: Re: How to remove external parentheses from a list