merge function to combine two tables
Dear R-help members I would be grateful if anyone could help me with the following problem: I would like to combine two matrices (Schmitt_15 and Schmitt_16, they are attached) which have a species presence/absence x sampling plot structure. The aim would be to have in the end only one matrix which shows all existing species and their presence/absence on all the different plots. To do this I used the "merge" function in R. The problem is that my matrix in the end shows only 12 species (but there are in total about 100!). I don't know why. I used the following commands: Schmitt_15 Schmitt_16 output<-merge(Schmitt_15,Schmitt_16,by="species") write.table(ab,file="output.txt",sep=",") Can anyone help me? Thank you very much! Michael -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: Schmitt_15.txt URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20130314/9ac19d53/attachment.txt> -------------- next part -------------- An embedded and charset-unspecified text was scrubbed... Name: Schmitt_16.txt URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20130314/9ac19d53/attachment-0001.txt> -------------- next part --------------