[R] Multiple line commands in R scripting

[Peter Ehlers]

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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