You should consult "An Introduction to R", section 11, "Writing your own
functions", along with any beginner books on R.
http://www.r-project.org/doc/bib/R-books.html
test <- function(x = 2) {
x^2
}
test() ## will give 4
test(3) ## will give 9
Marco Salvi wrote:
Hi, i'm tryng to build a function that take some input from user and if the
user doesn't provide that inputs the function should set a deafult value. I
have taken as example a function that i found in the package dlm but with
the same code i receive an error (the component is missing...). According to
the code below R seems to set 1 to "phi" instead of "p" ! The only way to
solve this problem that i found is to change "p" to "P", but this is clearly
the wrong solution ! There is some other way to set default value with that
function structure ? thanks
------------
Stem.Skeleton <- function(...) {
if (nargs() == 1)
x <- as.list(...)
else
x <- list(...)
## required components
comp <- c("phi", "p", "K")
if(is.null(list(x$p))) x$p = 1
compInd <- match(comp, names(x))
if (any(is.na(compInd)))
stop(paste("Component(s)", paste(comp[is.na(compInd)], collapse=", "
),
"is (are) missing"))
....
---------
Marco
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and provide commented, minimal, self-contained, reproducible code.
