match_exams_call: Query Information from Last xexams/exams2xyz Call

Description

match_exams_call queries the last call made to xexams (typically through some exams2xyz interface). match_exams_device queries the graphics device used in the last xweave call.

Usage

match_exams_call(which = 1L, deparse = TRUE)
match_exams_device()

Arguments

which: integer. Specifies the hierarchy level at which the exams2xyz call should be extracted.
deparse: logical. Should only the deparsed function name be computed (or the entire call)?

Details

The function match_exams_call is useful for determining within an exercise which exams2xyz interface is used in order to behave slightly differently, e.g., for PDF vs. HTML output. (This feature only works from R 3.2.0 onwards.)

Similarly, the function match_exams_device can be used within an exercise to use the same graphics device that xweave is using.

Examples

Run this code

## call exams2nops
dir.create(tdir <- tempfile())
exams2nops("tstat2.Rnw", dir = tdir)
match_exams_call()

## graphics device used
match_exams_device()

## exams2nops called exams2pdf called xexams:
match_exams_call(which = NULL)

## get full exams2nops call
match_exams_call(deparse = FALSE)

# \donttest{
## but note that convenience wrappers etc. are included
e2n <- function(...) exams2nops(...)
e2n("tstat2.Rnw", dir = tdir)
match_exams_call(which = NULL)
# }

Run the code above in your browser using DataCamp Workspace