[R] Multiple line commands in R scripting
Peter Ehlers
ehlers at ucalgary.ca
Sun Oct 25 16:43:23 CET 2009
Here are two ways:
1. wrap the line in braces:
x <- {....
/...}
2. maybe more awkward in general, but sometimes useful:
x <- `/`(... ,
...)
-Peter Ehlers
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.
>
> Thank you,
> Neil.
>
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