On 13/12/2017 10:31 AM, Jinsong Zhao wrote:
Hi there,
I don't know why the following codes are return different results.
> ifelse(3 > 2, 1:3, length(1:3))
[1] 1
> if (3 > 2) 1:3 else length(1:3)
[1] 1 2 3
Any hints?
The documentation in the help page ?ifelse and ?"if" explains it pretty
clearly. Think of ifelse() as a function with vector inputs and a
vector output, and if() as a flow control construction.
Duncan Murdoch
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