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Re: Help with concatenating a list with &&

  • To: mathgroup at smc.vnet.net
  • Subject: [mg102185] Re: Help with concatenating a list with &&
  • From: Yves Klett <yves.klett at googlemail.com>
  • Date: Sat, 1 Aug 2009 03:56:21 -0400 (EDT)
  • References: <h4uet9$inv$1@smc.vnet.net>

Hi,

And @@ {ex1, ex2, ex3, ex4}

works nicely. If I am not mistaken, "&&" is the infix notation...

Regards,
Yves

janey schrieb:
> 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.
> 


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