R help - Aug 2015 - Splitting lines in R script

I have a line containing summation of four components.

# This works OK:
  p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)-
    -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)

# This produces unpredicted results without warning:
  p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)
    -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)

Is there a general rule of thumb for line breaks? Thanks you.

	[[alternative HTML version deleted]]

R does not need a semicolon or other character to terminate a command;
if a line can be interpreted as a complete command, it will (first
line in your second example).

Also note that the first example may not produce what you want (if
your second example is any indication) - the result of
pbivnorm(aa,dd,tau) is added to the sum of the first two terms,
because the two minuses give a plus:
> 1- -1
[1] 2

Peter

On Sun, Aug 2, 2015 at 9:05 PM, Steven Yen <syen04 at gmail.com>
wrote:
> I have a line containing summation of four components.
>
> # This works OK:
>   p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)-
>     -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)
>
> # This produces unpredicted results without warning:
>   p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)
>     -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)
>
> Is there a general rule of thumb for line breaks? Thanks you.
>
>         [[alternative HTML version deleted]]
>
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Hi Steven,
In general, the command line must be incomplete (in your case, a
trailing hyphen) for the interpreter to take the next line as a
continuation.

Jim


 On Sun, Aug 2, 2015 at 9:05 PM, Steven Yen <syen04 at gmail.com>
wrote:
> I have a line containing summation of four components.
>
> # This works OK:
>   p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)-
>     -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)
>
> # This produces unpredicted results without warning:
>   p<-pbivnorm(bb,dd,tau)+pbivnorm(aa,cc,tau)
>     -pbivnorm(aa,dd,tau)-pbivnorm(bb,cc,tau)
>
> Is there a general rule of thumb for line breaks? Thanks you.
>