[R] Google style

Mark Knecht markknecht at gmail.com
Mon Aug 31 19:33:44 CEST 2009

On Mon, Aug 31, 2009 at 10:00 AM, Duncan Murdoch<murdoch at stats.uwo.ca> wrote:
> On 8/31/2009 11:50 AM, Mark Knecht wrote:
>> On Mon, Aug 31, 2009 at 6:36 AM, Terry Therneau<therneau at mayo.edu> wrote:
>> <SNIP>
>>> The authors borrowed so much else from C, the semicolon would have been
>>> good too.
>> <SNIP>
>> I know real R coders will chuckle
> I'd say cringe, rather than chuckle.  This is going to make you waste a lot
> of time some day, when you stare and stare at code like Terry's and can't
> figure out what's wrong with it:
>        zed <- function(x,y,z) {
>               x + y
>                 +z;
>              }
> The value of the function is +z, not x+y+z, even though the C part of your
> brain made you type it that way and reads it as one statement in the body,
> not two.
> Duncan Murdoch

Oh, I completely agree.

Nominally I would have broken my rules for inserting semi-colons as
shown above. I should have done something more like this:

zed <- function(x,y,z) {
               x + y;

but your point is completely correct. If I start forgetting that the
semi-colon is doing nothing then I'll cause myself problems. Also, if
I hot some case where the semi-colon serves a real purpose in R I'll
be totally confused, so this isn't a good thing to be doing. Not sure
I'll continue, but as I learn the language it's helped me see where
code lines end a bit better.


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