Segfault from knn.cv in class package (PR#6856)
This is user error. R-bugs is not the appropriate place to report user error in a contributed package -- please do read the R FAQ.
On Wed, 5 May 2004 jmacdon@med.umich.edu wrote:
The function knn.cv in the class package doesn't have error checking to ensure that the length of the classlabel argument is equal to the number of rows in the test set. If the classlabel is short, the result is often
There is no *test* set in knn.cv, nor is there a `classlabel argument'.
There is
cl: factor of true classifications of training set
and that has been specified incorrectly.
a segfault.
library(class) dat <- matrix(rnorm(1000), nrow=10) cl <- c(rep(1,5), rep(2,5)) cl2 <- c(rep(1,5), rep(2,4)) knn.cv(dat, cl)
[1] 2 2 1 2 1 2 2 2 2 2 Levels: 1 2
knn.cv(dat, cl2) # May have to try more than once to get segfault.
This also occurs on my linux box. Best, Jim --please do not edit the information below-- Version: platform = i386-pc-mingw32 arch = i386 os = mingw32 system = i386, mingw32 status = major = 1 minor = 9.0 year = 2004 month = 04 day = 12 language = R Windows XP Professional (build 2600) Service Pack 1.0 Search Path: .GlobalEnv, package:methods, package:stats, package:graphics, package:utils, Autoloads, package:base James W. MacDonald Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623
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Brian D. Ripley, ripley@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