'An efficient way to expand R vector
In R, I have a vector of indices (A) and values (B). What is an efficient (preferably parallel) approach in R to expand A and B to C, where C is the values in B located in the index of A?
Example:
A = c(4, 7, 11, 20)
B = c(11, 14, 22, 3)
C = c(0,0,0,11,0,0,14,0,0,0,22,0,0,0,0,0,0,0,0,3)
The Brute-force approach is a for-loop which is not what I am looking for.
Sources
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