[Rd] e1071 ver 1.5-27 and older - SVM bug report

David Meyer meyerd at technikum-wien.at
Sat Aug 6 12:38:11 CEST 2011

Dear Pawel:

yes, this is a bug. Fixed in the next release.




Dear All:

I found a problem with the SVM internal cross-validation (CV) accuracy
estimation in the e1071 package.

File: Rsvm.c
Line: 120

Today, it is:

int j = rand()%(prob->l-i);

Should be:

int j = i + rand()%(prob->l-i);

The erroneous code doesn't shuffle objects. Instead, it "randomly"
moves objects from beginning to the end.

More information about the R-devel mailing list