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Re: How to remove external parentheses from a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg131518] Re: How to remove external parentheses from a list
  • From: Joe Gwinn <joegwinn at comcast.net>
  • Date: Sat, 17 Aug 2013 02:05:43 -0400 (EDT)
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  • References: <kul0bk$rkj$1@smc.vnet.net>

In article <kul0bk$rkj$1 at smc.vnet.net>, 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.

I use Apply, as in the following, where Xcd is some function:

Apply[Xcd[#]&, {{x1,a,b}, {x2,c,d}, {xn,y,z}} ]

Depending the function you are using, you may need to use such things
as #[[1]] as variables.  Read the docs on "pure functions".

Joe Gwinn



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