[R] Excluding rows from a matrix
Peter Dalgaard BSA
p.dalgaard at biostat.ku.dk
Mon Aug 21 16:47:42 CEST 2000
José Ernesto Jardim <ernesto at ipimar.pt> writes:
> I have a matrix (4 x 950) and I want to remove 3 rows, where the values
> from the first column are 713, 714 and 715. I can select the rows, one
> by one, with
> but I'm unable to (i) select the 3 rows at once, (ii) select the matrix
> excluding those rows.
> How can I do it ?
Um, if you can do that, then mat is a dataframe, not a matrix!
mat[!(mat$first %in% 713:715),]
would seem to work.
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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