[R] Indexing With List Of Vectors (Replacement)

[Paul Roebuck]

I have the following:

> a <- matrix(1:10, nrow = 2, byrow = TRUE)
> b <- array(as.integer(0), c(7, 5))
> idx <- list()
> length(idx) <- 2
> dim(idx) <- c(1, 2)
> idx[[1]] <- as.integer(1:2)
> idx[[2]] <- as.integer(1:5)

I can do the following, which works if 'b' is a matrix.

> b[idx[[1]], idx[[2]]] <- a
> b
     [,1] [,2] [,3] [,4] [,5]
[1,]    1    3    5    7    9
[2,]    2    4    6    8   10
[3,]    8    8    8    8    8
[4,]    8    8    8    8    8
[5,]    8    8    8    8    8
[6,]    8    8    8    8    8
[7,]    8    8    8    8    8

Looking for a way to do this generically such that 'idx'
with 'n' length can be used to index n-dimensional arrays.

b[<<<translate 'idx' to array indices>>>] <- a

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SIGSIG -- signature too long (core dumped)