[Rd] Interpretation of escaped characters in \examples{}

Kurt Hornik hornik at ci.tuwien.ac.at
Mon Jun 9 10:56:18 MEST 2003

>>>>> Gordon Smyth writes:

> Dear Kurt,


> When going from the help file to rendered code, double backlashes are
> now left as-is. Single backslashes are removed, *except* for "\b",
> "\n", "\r" and "\f". Escaped t's, "\t" are converted to actual tabs.

Going from help to rendered code means via example()?  What happens
there is that is R-ex file is *sourced*, i.e., parsed and evaluated, so
what we see is what R does.

> Is this all as it is supposed to be? The conversion of \t to <tab>
> does seem a potential problem.

> The conversion of \t to <tab> occurs in other examples of rendering
> code also, for example:

>> myfun <- function(x,pattern="\t") "hello"
>> args(myfun)
> function (x, pattern = "        ")

I cannot reproduce this: if I add

f <- function(x = "\t") "hello"

to eda/R-ex/line.R and do example("line", "eda") I get

line> f <- function(x = "\t") "hello"

line> args(f)
function (x = "\t") 

without the tab being expanded ...


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