Not an issue with pipes. The pipe just rewrites the expression to a
nested call and that is then evaluated. The call this produces is
quote(L |>
+ gsub(pattern = " ", replacement = "") |>
+ gsub(pattern = " ", replacement = "") |>
+ textConnection() |>
+ read.dcf())
read.dcf(textConnection(gsub(gsub(L, pattern = " ", replacement = ""),
pattern = " ", replacement = "")))
If you run that expression, or just the argument to read.dcf, then you
get the error you report. So the issue is somewhere in textConnection().
This produces a similar message:
read.dcf(textConnection(c(L, "aaaaaaaaaaaaaaaaaa", "bbbbbbbbbbbbbbbb",
"cccccccccccccccc", "ddddddddddddddddddd")))
File a bug report and someone who understands the textConnection()
internals better than I do can take a look.
Best,
luke
On Tue, 10 Aug 2021, Gabor Grothendieck wrote:
This gives an error bit if the first gsub line is commented out then there is no
error even though it is equivalent code.
L <- c("Variable:id", "Length:112630 ")
L |>
gsub(pattern = " ", replacement = "") |>
gsub(pattern = " ", replacement = "") |>
textConnection() |>
read.dcf()
## Error in textConnection(gsub(gsub(L, pattern = " ", replacement = ""), :
## argument 'object' must deparse to a single character string
That is this works:
L |>
# gsub(pattern = " ", replacement = "") |>
gsub(pattern = " ", replacement = "") |>
textConnection() |>
read.dcf()
## Variable Length
## [1,] "id" "112630"
R.version.string
## [1] "R version 4.1.0 RC (2021-05-16 r80303)"
win.version()
## [1] "Windows 10 x64 (build 19042)"
--
Luke Tierney
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa Phone: 319-335-3386
Department of Statistics and Fax: 319-335-3017
Actuarial Science
241 Schaeffer Hall email: [email protected]
Iowa City, IA 52242 WWW: http://www.stat.uiowa.edu
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