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