On Wed, 19 Jan 2005 [EMAIL PROTECTED] wrote:
Dear r-bugs,
Whilst playing with ppoints I discovered that when one uses it directly, occasional NA's in a vector also become data fractions:
ppoints(c(1,2,NA,4))
Would it be a good idea to add a warning message as in:
ppoints <- function (n, a = ifelse(n <= 10, 3/8, 1/2)) { if(any(is.na(n))) warning("'n' contains NA's") if(length(n) > 1) n <- length(n) if(n > 0) (1:n - a)/(n + 1-2*a) else numeric(0) }
Why? There are 4 points in your vector, and the result is perfectly valid as documented, even if they were all NAs.
Another minor remark concerning ?ppoints. It says:
n: either the number of points generate or a vector of observations. ^^^^^
As you see, that does not line up, but the typo has been fixed.
-- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595
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