I tested as.numeric(as.character(Ratio))
and it works perfectly! I still don't get why as.numeric(Ratio) was not enough, but at least now I know how to deal with it. Thanks for the tip, and sorry for missing the R-FAQ issue 7.10. Cheers, Alexandre Santos 2007/11/6, John Kane <[EMAIL PROTECTED]>: > Have a look at the R-FAQ issue 7.10. It's a standard > problem > > For more information about your variable try > > str(variable). > > > --- Alexandre Santos <[EMAIL PROTECTED]> > wrote: > > > Dear R list, > > > > I would like to perform an ANOVA in a set of > > measurements, but I have > > problems formatting the data. > > > > The data is a two dimensional array containing two > > columns: > > - "Stim" : the type of stimulation (string) > > - "Ratio" : a ratio of two numeric values > > > > Now, because some values are missing in the data > > (defaulting to zero), > > part of this array will be populated with NA ratios. > > Maybe this is > > important later. > > > > In order to make the ANOVA analysis, I need to turn > > my vector into a data.frame. > > > > I tried vector.table=as.data.frame(vector) > > > > But I realized that > > is.numeric(Ratio) gives FALSE > > is.factor(Ratio) gives TRUE > > > > After reading the documentation, I tried > > > > vector.table=as.data.frame(vector, stringsAsFactors > > = FALSE) > > > > This time > > > > is.numeric(Ratio) gives FALSE > > is.factor(Ratio) gives FALSE > > > > So I don't even know what is Ratio, but it's not yet > > numeric (is this > > due to the NA values?). > > > > How can I get R to understand that Ratio is numeric? > > Checking the > > documentation it seems you can do it with I(x), but > > the details are > > not explained. I also tried as.numeric(Ratio), and > > everything was > > turned into zeros. > > > > Any suggestions? > > > > Cheers, > > > > Alexandre Santos > > > > Neuro-MPI, Martinsread, Germany > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, > > reproducible code. > > > > > > ____________________________________________________ > Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your > favourite sites. Download it now at > http://ca.toolbar.yahoo.com. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
