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Re: ReplaceAll and rules from a list v7.0

  • To: mathgroup at smc.vnet.net
  • Subject: [mg104245] Re: ReplaceAll and rules from a list v7.0
  • From: Szabolcs Horvát <szhorvat at gmail.com>
  • Date: Sun, 25 Oct 2009 01:05:05 -0400 (EDT)
  • References: <hbu7qi$7hn$1@smc.vnet.net>

On 2009.10.24. 8:45, kristoph wrote:
> Hi,
>
> Suppose I have the equation
>
> x=a+b
>
> and the list
>
> l={{1,1},{2,2},{3,3}}
>
> How can I quickly assign the list to the above equation, that is, I
> would like to get the following result
>
> {2,4,6}
>
> The first element of each sub-list should be assigned to a and the
> second to b.
>
> Thanks in advance.
> Kristoph
>

Use Plus @@@ l  (#1+#2& @@@ l for a more readily generalizable form)


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