On 25/11/2019 2:27 p.m., Neal Fultz wrote:
Hi Mik,
Echoing Bert and Duncan's suggestions, please see also ?srcref and
?getSrcref
and consider upgrading to a currently supported version of R.
I'd also call out the "keep.source" installation option as important if
your functions
are inside a package - there is some discussion around this at
https://github.com/DeclareDesign/DesignLibrary/issues/50 and linked issues
from
the last time I encountered this weird corner of R.
If anyone finds a better solution (or for the related problem of preserving
whitespace),
I would be interested as well.
Preserving comments and whitespace are definitely the same issue. I'm
not sure what solution you're trying to improve, but if you want source
kept in packages, run
Sys.setenv(R_KEEP_PKG_SOURCE="yes")
before doing the install using install.packages(), or use the command
line option with R CMD INSTALL.
If you want the source kept for your own function regardless of the
user's wishes, I think you'll have to do some weird things in your
source files. For example, if pkg::fn is defined in the file
pkg/R/fn.R, you could put this into your zzz.R file (any name is fine,
as long as it collates after fn.R):
sys.source("R/fn.R", keep.source = TRUE, envir = getNamespace("pkg"))
This will replace fn with a new copy that has source references. It
assumes that the namespace has been created at this point in
installation; I think that's true, but there may be cases where it's not
true, in which case you'll need to use something like environment(fn) as
the envir argument.
Duncan Murdoch
Very respectfully,
Neal Fultz
On Mon, Nov 25, 2019 at 10:49 AM Duncan Murdoch <murdoch.dun...@gmail.com>
wrote:
On 24/11/2019 6:06 p.m., bic...@math.usask.ca wrote:
I have made a list in which each element is a function. If I print
individual elements of the list, then the function code is shown along
with embedded comments. However, if I print the list or sublist, then
the
function code is shown without comments. Why (and how) are the comments
hidden?
Hi Mik. I see the same behaviour as Bert, not what you see.
Generally the comments will be shown if the "srcref" attribute is
attached to the function, and it is a valid one. That shouldn't change
between looking at flist[[3]] and flist[3]. If it's not there or not
valid, you'll see a deparsed version of the function; that's what your
flist[3]$btv looks like.
It's possible this is R 3.3.2-specific; that's a relatively old version
now, but I don't know of any change that would cause this. Can you show
us the code that you used to create flist, or enough of it to show this
behaviour? Showing us (or me privately) dput(flist) might be enough to
see what's going on.
Duncan Murdoch
flist[[3]]
function(y,brackets,rates){
# Calculates before-tax income required to realized value y
ints<-c(0,cumsum(diff(brackets)*rates[1:(length(rates)-1)]))-brackets*rates
x<-(y+ints)/(1-rates)
x[sum(x>brackets)]
}
flist[3]
$btv
function (y, brackets, rates)
{
ints <- c(0, cumsum(diff(brackets) * rates[1:(length(rates) -
1)])) - brackets * rates
x <- (y + ints)/(1 - rates)
x[sum(x > brackets)]
}
I am running R 3.3.2 on Mac OS X 10.10.5
Mik Bickis
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