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reg-IO2.R
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## tests of boundary cases in read.table()
## force standard handling for character cols
options(stringsAsFactors=TRUE)
# empty file
file.create("foo1")
try(read.table("foo1")) # fails
read.table("foo1", col.names=LETTERS[1:4])
unlink("foo1")
# header only
cat("head\n", file = "foo2")
read.table("foo2")
try(read.table("foo2", header=TRUE)) # fails in 1.2.3
unlink("foo2")
# header detection
cat("head\n", 1:2, "\n", 3:4, "\n", file = "foo3")
read.table("foo3", header=TRUE)
read.table("foo3", header=TRUE, col.names="V1")
read.table("foo3", header=TRUE, row.names=1)
read.table("foo3", header=TRUE, row.names="row.names")
read.table("foo3", header=TRUE, row.names="head") # fails in 1.2.3
# wrong col.names
try(read.table("foo3", header=TRUE, col.names=letters[1:4]))
unlink("foo3")
# incomplete last line
cat("head\n", 1:2, "\n", 3:4, file = "foo4")
read.table("foo4", header=TRUE)
unlink("foo4")
# blank last line
cat("head\n\n", 1:2, "\n", 3:4, "\n\n", file = "foo5")
read.table("foo5", header=TRUE)
# test of fill
read.table("foo5", header=FALSE, fill=TRUE, blank.lines.skip=FALSE) # fails in 1.2.3
unlink("foo5")
cat("head\n", 1:2, "\n", 3:5, "\n", 6:9, "\n", file = "foo6")
try(read.table("foo6", header=TRUE))
try(read.table("foo6", header=TRUE, fill=TRUE))
read.table("foo6", header=FALSE, fill=TRUE)
unlink("foo6")
# test of type conversion in 1.4.0 and later.
cat("A B C D E F\n",
"1 1 1.1 1.1+0i NA F abc\n",
"2 NA NA NA NA NA NA\n",
"3 1 2 3 NA TRUE def\n",
sep = "", file = "foo7")
(res <- read.table("foo7"))
sapply(res, typeof)
sapply(res, class)
(res2 <- read.table("foo7",
colClasses = c("character", rep("numeric", 2),
"complex", "integer", "logical", "character")))
sapply(res2, typeof)
sapply(res2, class)
unlink("foo7")
# should be logical
type.convert(character(0))
# test of comments in data files
cat("# a test file",
"# line 2",
"# line 3",
"# line 4",
"# line 5",
"## now the header",
" a b c",
"# some more comments",
"1 2 3",
"4 5 6# this is the second data row of the file",
" # some more comments",
"7 8 9",
"# trailing comment\n",
file= "ex.data", sep="\n")
read.table("ex.data", header = T)
unlink("ex.data")
## comment chars in headers
cat("x1\tx#2\tx3\n1\t2\t2\n2\t3\t3\n", file = "test.dat")
read.table("test.dat", header=T, comment.char="")
unlink("test.dat")
cat('#comment\n\n#another\n#\n#\n',
'C1\tC2\tC3\n"Panel"\t"Area Examined"\t"# Blemishes"\n',
'"1"\t"0.8"\t"3"\n', '"2"\t"0.6"\t"2"\n', '"3"\t"0.8"\t"3"\n',
file = "test.dat", sep="")
read.table("test.dat")
unlink("test.dat")
cat('%comment\n\n%another\n%\n%\n',
'C1\tC2\tC3\n"Panel"\t"Area Examined"\t"% Blemishes"\n',
'"1"\t"0.8"\t"3"\n', '"2"\t"0.6"\t"2"\n', '"3"\t"0.8"\t"3"\n',
file = "test.dat", sep="")
read.table("test.dat", comment.char = "%")
unlink("test.dat")
## test on Windows Unicode file
con <- file(file.path(Sys.getenv("SRCDIR"), "WinUnicode.dat"),
encoding="UCS-2LE")
scan(con, 0, quiet=TRUE)
close(con)
## tests of allowEscape
x <- "1 2 3 \\ab\\c"
writeLines(x, "test.dat")
readLines("test.dat")
scan("test.dat", "", allowEscapes=TRUE)
scan("test.dat", "", allowEscapes=FALSE)
read.table("test.dat", header=FALSE, allowEscapes=TRUE)
read.table("test.dat", header=FALSE, allowEscapes=FALSE)
x <- c("TEST", 1, 2, "\\b", 4, 5, "\\040", "\\x20",
"c:\\spencer\\tests",
"\\t", "\\n", "\\r")
writeLines(x, "test.dat")
read.table("test.dat", allowEscapes=FALSE, header = TRUE)
unlink("test.dat")
## end of tests