Converts a call stack into a list of printable strings ("labels") with a limited length per call. If source code references are available they are also added in the form \<file name\>#\<line number\>: executed R expression (call)
limitedLabelsCompact(value, compact = FALSE, maxwidth = getOption("width") -
5L)a list of calls ("call.stack") generated by sys.calls
if TRUE only calls that contain a source code reference (attribute "srcref") are returned (plus always the first call); if FALSE all calls will be returned.
Maximum number of characters per call in the return value (longer strings will be cutted). Must be between 40 and 1000
A list of strings (one for each call)
R does track source code references only if you set the option "keep.source" to TRUE via
options(keep.source = TRUE). Without this option this function cannot enrich source code references.
If you use Rscript to start a non-interactive R script as batch job you
have to set this option since it is FALSE by default. You can add this option to your
.Rprofile file or use a startup R script that sets this option and sources your
actual R script then.
This function is base on the undocumented limitedLabels function of the base package.
The source code can be viewed by entering limitedLabels in the R console.
The attributes required to add source file names and line numbers to the calls (srcref and srcfile)
and how they are created internally are explained in this article:
https://journal.r-project.org/archive/2010-2/RJournal_2010-2_Murdoch.pdf
# NOT RUN {
limitedLabelsCompact(sys.calls(), TRUE)
# }
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