[R] Unfound objects in function

[Prof Brian Ripley]

It does not say `unfound' it says `missing value'.  See ?NA.
Note it is the value and not the object that is said to be missing.

Looks like on your data that one or more of the values you are summing is 
NA.

On Tue, 18 Apr 2006, Colin Beale wrote:

> A couple of my functions that were working last week seem to have been
> changed over the weekend and no longer work, but I can't understand why
> not: it seems that objects defined at the start of the function are not
> located further on in the function, when this worked fine before. An
> example follows at the end, using the package spatstat, though the
> problem seems more general. My only guess is that I've accidentally
> changed something to do with the environment that functions are
> searching in to exclude themselves, but if so I've no idea how I did or
> how I can cancel it!
>
> Thanks in advance,
>
> Colin
>
>
> library (spatstat)
>
> kernelEst <- function (data, max.r = 10, edge = TRUE) {
>
>  if (!is.ppp (data)) stop ("data must be a point process object")
>
>  i <- 0.1
>  diff    <- 1
>  smo     <- 1
>
>  while (diff > 0) {
>    olddiff <- diff
>    oldsmo  <- smo
>    smo     <- density.ppp (data, sigma = 2 * i, edge = edge)
>    lambda  <- smo[data]
>    Ki      <- Kinhom (data[,data$window], lambda = lambda, r = seq (0,
> max.r, length = 100), correction = "trans")
>    diff    <- sum (Ki$theo - Ki$trans)
>    i       <- i + 0.1
>    if (i > max.r) stop ("no suitable kernel found within 0.2 to
> max.r")
>  }
>
>  if (abs (olddiff) > abs (diff)) return (smo) else return (oldsmo)
> }
>
> data (simdat)
> test <- kernelEst (simdat)
> Error in while (diff > 0) { : missing value where TRUE/FALSE needed
>
>
>
>> version
>         _
> platform i386-pc-mingw32
> arch     i386
> os       mingw32
> system   i386, mingw32
> status
> major    2
> minor    2.1
> year     2005
> month    12
> day      20
> svn rev  36812
> language R
>
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>

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
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