Re: How to remove external parentheses from a list

*To*: mathgroup at smc.vnet.net*Subject*: [mg131523] Re: How to remove external parentheses from a list*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Sat, 17 Aug 2013 02:07:23 -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*: <20130816110619.E9E426A0D@smc.vnet.net>

One way is to use Sequence with Apply (@@). For example: Integrate[x1 + x2^2, Sequence @@ {{x1, a, b}, {x2, c, d}}] On Aug 16, 2013, at 7:06 AM, 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. > > Thanks for any help and advice! > > Regards, > Sam > --- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower University of Massachusetts 710 North Pleasant Street Amherst, MA 01003-9305

**References**:**How to remove external parentheses from a list***From:*Samuel Mark Young <sy81@sussex.ac.uk>