The knitr::kable() function does some internal setup, including
determining the target format, and then calls an internal function using
do.call(paste("kable", format, sep = "_"), list(x = x,
caption = caption, escape = escape, ...))
I was interested in setting the `vlign` argument to knitr:::kable_latex,
using this code:
knitr::kable(head(mtcars), format="latex", align = "c", vlign="")
If I debug knitr::kable, I can see that `vlign = ""` is part of
list(...). However, if I debug knitr:::kable_latex, I get weird results:
> debug(knitr:::kable_latex)
> knitr::kable(head(mtcars), format="latex", align = "c", vlign="")
debugging in: kable_latex(x = c("Mazda RX4", "Mazda RX4 Wag", "Datsun
710",
"Hornet 4 Drive", "Hornet Sportabout", "Valiant", "21.0", "21.0",
"22.8", "21.4", "18.7", "18.1", "6", "6", "4", "6", "8", "6",
"160", "160", "108", "258", "360", "225", "110", "110", "93",
"110", "175", "105", "3.90", "3.90", "3.85", "3.08", "3.15",
"2.76", "2.620", "2.875", "2.320", "3.215", "3.440", "3.460",
"16.46", "17.02", "18.61", "19.44", "17.02", "20.22", "0", "0",
"1", "1", "0", "1", "1", "1", "1", "0", "0", "0", "4", "4", "4",
"3", "3", "3", "4", "4", "1", "1", "2", "1"), caption = NULL,
escape = TRUE, vlign = "")
debug: {
[rest of function display omitted]
I see here that vlign = "" is being shown as an argument. However, when
I print vlign, sometimes I get "object not found", and somethings I get
Browse[2]> vline
debug: [1] "|"
(which is what the default value would be). In the latter case, I also see
Browse[2]> list(...)
$vlign
[1] ""
i.e. vlign remains part of the ... list, it wasn't bound to the argument
named vlign.
I can't spot anything particularly strange in the way knitr is handling
this; can anyone else? My sessionInfo() is below.
Duncan Murdoch
> sessionInfo()
R version 4.3.1 (2023-06-16)
Platform: x86_64-apple-darwin20 (64-bit)
Running under: macOS Monterey 12.6.9
Matrix products: default
BLAS:
/Library/Frameworks/R.framework/Versions/4.3-x86_64/Resources/lib/libRblas.0.dylib
LAPACK:
/Library/Frameworks/R.framework/Versions/4.3-x86_64/Resources/lib/libRlapack.dylib;
LAPACK version 3.11.0
locale:
[1] en_CA.UTF-8/en_CA.UTF-8/en_CA.UTF-8/C/en_CA.UTF-8/en_CA.UTF-8
time zone: America/Toronto
tzcode source: internal
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_4.3.1 tools_4.3.1 knitr_1.44 xfun_0.40
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