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Re: ReplaceAll and rules from a list v7.0


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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