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)*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*: <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