Hello Mark Thanks a lot for the help, you was right it worked now with this command bed[12] <- ifelse(bed[11] < 0, abs(bed[11]*-1),bed[11]) thanks Thiago > Hi Thiago, > have a look at ?ifelse or ?abs > cheers, > Mark > > On 26/02/2013, at 10:46 PM, "Thiago [guest]" <guest at="" bioconductor.org=""> > wrote: > >> >> Hello >> >> I'm new at bioconductor and I have a very simple and stupid question, >> but I couldn undertand how to do that. >> >> I have a vector with a column with negative numbers(double). I want to >> change all negative to positive. >> I then made a function: >> ----------------------------- >> function(number){ >> if(number < 0){ >> number <- number * -1 >> } >> return(number) >> } >> ----------------------------- >> then I run >>> bed[12] <- arruma(bed[,11]) >> >> I got this error >> >> Warning message: >> In if (number < 0) { : >> the condition has length > 1 and only the first element will be used >> >> What happen is that all negative became positive and all positive >> became negative. >> >> Does enybody know what I'm doing wrong? >> >> thanks and best regards >> >> -- output of sessionInfo(): >> >>> sessionInfo() >> R version 2.15.2 (2012-10-26) >> Platform: x86_64-w64-mingw32/x64 (64-bit) >> >> locale: >> [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United >> States.1252 >> [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C >> [5] LC_TIME=English_United States.1252 >> >> attached base packages: >> [1] stats graphics grDevices utils datasets methods base >> >> loaded via a namespace (and not attached): >> [1] tools_2.15.2 >> >> -- >> Sent via the guest posting facility at bioconductor.org. >> >> _______________________________________________ >> Bioconductor mailing list >> Bioconductor at r-project.org >> https://stat.ethz.ch/mailman/listinfo/bioconductor >> Search the archives: >> http://news.gmane.org/gmane.science.biology.informatics.conductor > --