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MathGroup Archive 2013

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Re: How to remove external parentheses from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131527] Re: How to remove external parentheses from a list
  • From: Tomas Garza <tgarza10 at msn.com>
  • Date: Sat, 17 Aug 2013 02:08:43 -0400 (EDT)
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  • References: <20130816110619.E9E426A0D@smc.vnet.net>

Try using Sequence: as an example, suppose you have
list = {{x, 0, 2}, {y, 0, 1}}
which you want to use as the list of integration variables and limits. Then, by successively clicking on any of the inner brackets, select the elements of list without the outer brackets, copy and paste to get

NIntegrate[Exp[-x y], Sequence[{x, 0, 2}, {y, 0, 1}]]


1.31926


-Tomas


> From: sy81 at sussex.ac.uk
> Subject: How to remove external parentheses from a list
> To: mathgroup at smc.vnet.net
> Date: Fri, 16 Aug 2013 07:06:19 -0400
>
>
> 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
>
>


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