Hello all,
I don't understand a strange behavior in data frame manipulation.
data_frame1 = data.frame(Site = c("S1", "S2", "S3", "S4", "L1", "L2",
"L3", "L4"),
Number = c(1, 3, 5, 2, 1, 1, 2, 1))
data_frame2 = data_frame1 [data_frame1$Site != "S1", ]
dput (data_frame2)
structure(list(Site = structure(c(6L, 7L, 8L, 1L, 2L, 3L, 4L), .Label = c("L1",
"L2", "L3", "L4", "S1", "S2", "S3", "S4"), class = "factor"),
Number = structure(c(3L, 4L, 2L, 1L, 1L, 2L, 1L), .Label = c("1",
"2", "3", "5"), class = "factor")), .Names = c("Site", "Number"
), row.names = 2:8, class = "data.frame")
Why site "S1" do not disappeared from data_frame2's structure?
And what I have to do to eliminate it definitively from my new data
frame (data_frame2)?
Sorry for this basic question, but I really did not understand...
Thanks in advanced,
Raoni
--
Raoni Rosa Rodrigues
Research Associate of Fish Transposition Center CTPeixes
Universidade Federal de Minas Gerais - UFMG
Brasil
rodrigues.ra...@gmail.com
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