Re: How to remove external parentheses from a list
- To: mathgroup at smc.vnet.net
- Subject: [mg131529] Re: How to remove external parentheses from a list
- From: Joe Gwinn <joegwinn at comcast.net>
- Date: Tue, 20 Aug 2013 07:36:30 -0400 (EDT)
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- References: <kul0bk$rkj$1@smc.vnet.net> <kun3ch$3m6$1@smc.vnet.net>
In article <kun3ch$3m6$1 at smc.vnet.net>, Joe Gwinn
<joegwinn at comcast.net> wrote:
> In article <kul0bk$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".
Hmm. I had not heard of Sequence. Learned something.
Joe Gwinn