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...it(1024) The names of the 26 columns get denoted as y.1 to y.6, g.1 to g.6, yc.1 to yc.6, gc.1 to gc.6, yi and gi as these are the internal names. I wish to make a subset of the data using the logical vector R1(length 1024) so that only the cases where R1 is TRUE are included. I can do this by: R1data<-alldata[R1] that gives a vector 7800 long (there are 300 TRUE's in R1) so I do R1data<-as.data.frame(alldata[R1]) which gives a matrix 7800x1 so I write: R1data<-alldata[R1];dim(R1data)<-c(300,26) which gives the data in the right form except I haven't inherited the names...