Created
December 18, 2021 18:40
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| `[` <- function(x, ...) { | |
| base::`[`(x, ...) | |
| } | |
| makeActiveBinding(".I", function() { | |
| sc <- sys.calls() | |
| fr <- which(vapply(sc, \(x) capture.output(x)[1], character(1)) == "base::`[`(x, ...)") | |
| fr <- fr[length(fr)] | |
| sf <- sys.frames()[[fr-1]] | |
| x <- eval(quote(x), sf) | |
| NROW(x) | |
| }, .GlobalEnv) | |
| makeActiveBinding(".J", function() { | |
| sc <- sys.calls() | |
| fr <- which(vapply(sc, \(x) capture.output(x)[1], character(1)) == "base::`[`(x, ...)") | |
| fr <- fr[length(fr)] | |
| sf <- sys.frames()[[fr-1]] | |
| x <- eval(quote(x), sf) | |
| NCOL(x) | |
| }, .GlobalEnv) |
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