Hi, I am trying to index the rows of a model matrix where, due to missing values in the dataset used for the regression, the row numbers sometimes "jump" like this:
> X[17:19,] (Intercept) PCINIFM 17 1 36.76471 19 1 13.23529 20 1 32.35294 So, the problem is if I select for example X[20, ], I actually get the 21th observation. I've tried to work around this problem by using X[as.character(20) , ]. Thus I actually get what I want. However, I need to access sequences of rows, but if there is some missing row, this doesn't work: > X[as.character(17:19),] Error: subscript out of bounds Is there a way to make R handle this more gracefully, so that, in this case, it would just return the rows 17 and 19 without complaining? I apologize in advance for this dumb question of the beginner who I am and for which I didn't find a solution in the documentation! Thanks in advance, Nils ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
