Re: Help with concatenating a list with &&
- To: mathgroup at smc.vnet.net
- Subject: [mg102225] Re: [mg102153] Help with concatenating a list with &&
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Sat, 1 Aug 2009 04:04:37 -0400 (EDT)
- Reply-to: hanlonr at cox.net
ls = {ex1, ex2, ex3, ex4};
And @@ ls
ex1 && ex2 && ex3 && ex4
Apply[And, ls]
ex1 && ex2 && ex3 && ex4
Bob Hanlon
---- janey <janemkiwi at gmail.com> wrote:
=============
Can anyone help me make better use of mathematica's built in commands?
My problem is to take the list of expressions ls:
ls={ex1, ex2, ex3, ex4}
and connect them to obtain
ex1 && ex2 && ex3 && ex4
I thought I should be able to use
&& @@ ls
or equivalently Apply[&&, ls]
However this fails. I ended up using the very awkward
conditions = ls[[1]] && ls[[2]]
Do[conds = conds && ls[[i]], {i, 3, Length[ls]}]
which works but feels like just bludgeoning the problem
Does anyone know of a more elegant way to work this?
Thanks,
Jane.