On Fri, 28 Oct 2005, Federico Calboli wrote: > Hi All, > > I have the following problem, that's driving me mad. > > I have a dataframe of factors, from a genetic scan of SNPs. I DO have > NAs in the dataframe, which would look like: > > V4 V5 V6 V7 V8 V9 V10 > 1 TT GG TT AC AG AG TT > 2 AT CC TT AA AA AA TT > 3 AT CC TT AC AA <NA> TT > 4 TT CC TT AA AA AA TT > 5 AT CG TT CC AA AA TT > 6 TT CC TT AA AA AA TT > 7 AT CC TT CC <NA> <NA> TT > 8 TT CC TT AC AG AG TT > 9 AT CC TT CC AG <NA> TT > 10 TT CC TT CC GG GG TT > > > In the dataframe I have 1 column where one factor has been erroneosly > given alternative readings: CG and GC. > > I want to change the instances of GC to CG and I use the code: > > data[data[,30]=="GC", 30] = "CG" > > but get the error: > Error in "[<-.data.frame"(`*tmp*`, all[, 30] == "GC", 30 > missing values are not allowed in subscripted as > > Any hints?
1) Use %in% not == 2) (Better) As this is a factor, use levels<- to merge the levels. See ?levels. -- 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 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
