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