Try this also: xtabs(values ~ diagnosis + marker, data=dataframe)
On Wed, Nov 12, 2008 at 2:31 PM, Thorsten Raff <[EMAIL PROTECTED]>wrote: > Hello > > I have the problem that I want to transform a dataframe as generated by > > diagnosis <- rep(diagnosis[1:3], 3) > marker <- gl(3,3) > values <- rnorm(9) > dataframe <- cbind(diagnosis, marker, values) > dataframe <- dataframe[c(1:5, 7:9), ] > > into a matrix where levels(diagnosis) is indicating the rows of the matrix, > levels(marker) the columns and values are the actual content of the matrix. > However, as can been seen in the dataframe, some observations are missing > and > should result in <NAs> in the resulting matrix, giving a result like this: > > marker 1 2 3 > diagnosis1 value value value > diagnosis2 value value value > diagnosis3 value NA value > > Can anyone help out with some code for this? I have tried to look this up > in > the mailing list as it has probably been answered before but only found > aspects of the problem which I was just not able to plumb together. > > Many thanks in advance, I hope this is not to much of an insult for the > list. > > Thorsten > > P.S: I have already sent this message to the mailing list, howver I got a > bounce-message back, so hopefully this is no duplicate entry. Sorry for any > inconvenience that this may confer. > > > -- > Thorsten Raff > 2nd Medical Department, > University Hospital Schleswig-Holstein, Campus Kiel > Chemnitzstraße 33 > 24116 Kiel > GERMANY > > phone: +49 431 1697-5234 > fax: +49 431 1697-1264 > > email: t.raff<at>med2.uni-kiel.de > web: www.uk-s-h.de > > > > > ______________________________________________ > 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. > > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ 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.
