r - Variable matrix index and row/column as indices in a single function argument -


how handle variable matrix index , row/column indices in single function argument?

m <- matrix(1:9, 3)  fn <- function(m, subsetarg) {   stopifnot(m[subsetarg] == 6) }

i'd able use both situations:

a <- matrix(false, 3, 3) a[2,3] <- true # yielding # f f f # f f t # f f f fn(m, subsetargument = a)  # works

and

fn(m, subsetargument = tuple(2,3))  # <- not work logically

note after using range, example tuple(2, 1:3)

i understand done explicitly testing either 1 or 2 variables given, feel there might easier way.

just slurp arguments , pass them call [:

fn <- function(...) {   stopifnot(do.call(`[`, list(...)) == 6) }

everything in r function, including subsetting :-)


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