I think you are asking for Reduce
> Reduce(`+`, a)
[,1] [,2] [,3]
[1,] 3 0 0
[2,] 0 3 0
[3,] 0 0 3
>You might be asking for do.call with some function's name as its first argument.
> do.call("sum", a)
[1] 9
>
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