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Passing a list as seperate parameters?

• To: mathgroup at smc.vnet.net
• Subject: [mg73194] Passing a list as seperate parameters?
• From: "Azumanga" <4zumanga at gmail.com>
• Date: Wed, 7 Feb 2007 05:06:07 -0500 (EST)

I have a recuring problem in using mathematica, which I'm sure there
must be a simple fix for, but I've looked through the manual and can't
find it.

As an example, I build up the list { {a,b},{c,d} }, and I want to find
the union of it's elements.

At first glance, I want Union. However, Union wants it's input as
Union[{a,b},{c,d}], Union[{{a,b},{c,d}}] doesn't do anything.

In general I get around this by fold, but it seems there should be a
simpler method?

• Follow-Ups:
  • Re: Passing a list as seperate parameters?
    • From: gardyloo <gardyloo@mail.wsu.edu>
  • Re: Passing a list as seperate parameters?
    • From: János <janos.lobb@yale.edu>
  • Re: Passing a list as seperate parameters?
    • From: Sseziwa Mukasa <mukasa@jeol.com>