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Re: ReplaceAll and rules from a list v7.0


In[1]:= l = {{1, 1}, {2, 2}, {3, 3}};
Apply[Plus, l, {1}]
Out[2]= {2, 4, 6}
In[3]:= l /. {x_, y_} :> x + y
Out[3]= {2, 4, 6}

Adriano Pascoletti

2009/10/24 kristoph <kristophs.post at web.de>

> 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
>
>


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