On 2013-03-22 11:43, Christofer Bogaso wrote:
Hello again,
Let say I have following user defined function:
fn <- function(x, y) {
Vec1 <- letters[1:6]
Vec2 <- 1:5
return(list(ifelse(x > 0, Vec1, NA), ifelse(y > 0, Vec2, NA)))
}
Now I have following calculation:
fn(-3, -3)
[[1]]
[1] NA
[[2]]
[1] NA
fn(3, -3)
[[1]]
[1] "a"
[[2]]
[1] NA
Here I can not understand why in the second case, I get only the first
element "a" of the corresponding vector 'Vec1'? I want to get complete
vector(s) as the function return.
Can somebody help me how to achieve that?
From help(ifelse):
"ifelse returns a value with the same shape as test"
i.e. in your case, the same 'shape' as 'x > 0', a single value.
You _could_ make ifelse() work with, e.g., ifelse(rep(x, 6) > 0, ....)
but you probably want if() instead.
Peter Ehlers
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