R Question
How to find the file where a function is defined?
The question's title pretty much says it all.
The solution given here doesn't always work. E.g.,
> class(facet_grid)
[1] "function"
> attr(facet_grid, "srcref")
NULL
> attributes(facet_grid)
NULL
Answer
The environment()-function will return the package in which a function is "located" after it is loaded.
> environment(facet_grid)
<environment: namespace:ggplot2>
After downloading ggplot2_version_whatever.tag.gz from CRAN (or perhaps github) and expanding it, you can find (using your system text search facilities) a file named facet-grid.r that has this definiton starting at line 125:
facet_grid <- function(facets, margins = FALSE, scales = "fixed", space = "fixed", shrink = TRUE, labeller = "label_value", as.table = TRUE, switch = NULL, drop = TRUE) {
You should find more comments. Comments are dropped during compiling unless you make special efforts to retain them.
Source (Stackoverflow)