On Oct 25, 2009, at 8:53 AM, Neil Stewart wrote:
I'm wondering whether there is a character to let R know to expect
more
input for a command on subsequent lines. Here is an example:
test_1.R:
x <- c(1,2,3,4)
/ c(1,2,3,4)
x
R CMD BATCh test_1.R produces test_1.Rout:
x <- c(1,2,3,4)
/ c(1,2,3,4)
Error: unexpected '/' in " /"
Execution halted
test_2.R:
x <- c(1,2,3,4) /
c(1,2,3,4)
x
R CMD BATCh test_1.R produces test_2.Rout:
x <- c(1,2,3,4) /
+ c(1,2,3,4)
x
[1] 1 1 1 1
test_2.R works as expected but test_1.R fails because the "/"
operator is at
the start of line 2 not the end of line 1.
Is the some kind of continuation charater one can include in a
script so R
is expecting input on the next line? For example, in other
languages, "\"
works. Without this, one is forced to break lines carefully in the
middle of
a function, for example, to ensure R is expecting more. Any comments
very
welcome.
R waits for a complete command. Leave the "/" at the end of the first
line and it will then be incomplete. It is also common to see ","'s
(commas) at the end of lines in scripts.
test_1.R:
x <- c(1,2,3,4)/
c(1,2,3,4)
x
# Should "work"
Thank you,
Neil.
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
