[R-wiki] Be careful of syntax!
Philippe Grosjean
phgrosjean at sciviews.org
Wed Feb 1 14:57:23 CET 2006
..............................................<°}))><........
) ) ) ) )
( ( ( ( ( Prof. Philippe Grosjean
) ) ) ) )
( ( ( ( ( Numerical Ecology of Aquatic Systems
) ) ) ) ) Mons-Hainaut University, Pentagone (3D08)
( ( ( ( ( Academie Universitaire Wallonie-Bruxelles
) ) ) ) ) 8, av du Champ de Mars, 7000 Mons, Belgium
( ( ( ( (
) ) ) ) ) phone: + 32.65.37.34.97, fax: + 32.65.37.30.54
( ( ( ( ( email: Philippe.Grosjean at umh.ac.be
) ) ) ) )
( ( ( ( ( web: http://www.umh.ac.be/~econum
) ) ) ) ) http://www.sciviews.org
( ( ( ( (
..............................................................
Peter Dalgaard wrote:
> Philippe Grosjean <phgrosjean at sciviews.org> writes:
>
>
>>- Try to format R code as the implicit "R-Core Team formatting", in
>>particular:
>> + Forget about T/F and always use TRUE/FALSE
>> + Forget about '=' for assignation ands always use '->'
>> + Use spaces for clearer code in math operations, after commas,
>>between the equal sign in named arguments, for instance:
>>
>>f <- function(x, y, nam.rm = TRUE) {
>> if (na.rm) {
>> x <- na.omit(x)
>> y <- na.omit(y)
>> }
>> x + log(y)^2 - y
>>}
>>
>> + Indent (use four spaces for each indentation instead of tabs, to
>>make sure it is correct)
>> + Bracket indentation should be as the example here above.
>> + Use named arguments as much as possible, because it is more explicit)
>> + Use meaningful variable names
>
>
> And of course, make sure that the code actually works (the above
> does not in two different ways...)
Oooops! Thank you Peter. One should read something like:
f <- function(x, y, na.rm = TRUE) {
dat <- data.frame(x, y)
if (na.rm)
dat <- na.omit(dat)
return(dat$x + log(dat$y)^2 - dat$y)
}
(note that the function is not doeing something useful... it is just to
illustrate code formatting!)
Philippe Grosjean
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