adding two vectors or lists in R -

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i have 2 list or vectors following in r:

vector 1      d1    d2   d3   d4 2   0.75   1   0.25   0  vector 2 [1] "1" "3"

i need add values of vector 1 considering values of vector2, mean in example add values of d1 plus d3 because vector 2 has indexes. considering in using loop traverse vector 2 , adding values of vector1, not other more direct way perform operation? remember can used converting indexes in t, f values, frankly quite don't remember.

try:

sum(vector1[match(vector2, gsub("d", "", names(vector1)))]) [1] 1

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