Hello, I don't understand the behavior of apply() on the data frame below.
test <-
structure(list(Date = structure(c(13361, 13361, 13361, 13361,
13361, 13361, 13361, 13361, 13362, 13362, 13362, 13362, 13362,
13362, 13362, 13362, 13363, 13363, 13363, 13363, 13363, 13363,
13363, 13363, 13364, 13364, 13364, 13364, 13364, 13364, 13364,
13364, 13365, 13365, 13365, 13365, 13365, 13365, 13365, 13365,
13366, 13366, 13366, 13366, 13366, 13366, 13366, 13366, 13367,
13367), class = "Date"), RANK = as.integer(c(19, 7, 5, 4, 6,
3, 3, 4, 18, 7, 6, 4, 6, 3, 3, 4, 19, 7, 6, 4, 6, 3, 3, 4, 18,
6, 7, 4, 6, 3, 3, 4, 18, 6, 7, 4, 6, 3, 3, 4, 18, 6, 7, 4, 6,
3, 3, 4, 18, 6))), .Names = c("Date", "RANK"), row.names = c("1",
"2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
"14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24",
"25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35",
"36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46",
"47", "48", "49", "50"), class = "data.frame")
#---fine
Date RANK
Min. :2006-08-01 Min. : 3.00
1st Qu.:2006-08-02 1st Qu.: 4.00
Median :2006-08-04 Median : 5.50
Mean :2006-08-03 Mean : 6.62
3rd Qu.:2006-08-05 3rd Qu.: 6.75
Max. :2006-08-07 Max. :19.00
#---isn't this supposed to work?
Date RANK
NA NA
Warning messages:
1: argument is not numeric or logical: returning NA in:
mean.default(newX[, i], ...)
2: argument is not numeric or logical: returning NA in:
mean.default(newX[, i], ...)
Thank you,
b.
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status
major 2
minor 4.0
year 2006
month 10
day 03
svn rev 39566
language R
version.string R version 2.4.0 (2006-10-03)