read.zoo is a convenience function which should make it easier
to read data from a text file and turn it into a "zoo" series
immediately. read.zoo reads the data file via read.table(file, ...).
The first column of the resulting data is interpreted to be the index, the
remaining columns the corresponding data. (If the file only has only column
then that is assumed to be the data column and 1, 2, ... are used
for the index.) To assign the appropriate class
to the index, FUN can be specified and is applied to the first column.
By default, read.zoo uses as.Date(as.character(x), format = format) if format is
specified and as.POSIXct(as.character(x), tz = tz) if tz
is specified; otherwise it tries to guess between "numeric",
"Date" and "POSIXct".
If regular is set to TRUE and the resulting series has an underlying
regularity, it is coerced to a "zooreg" series.
## turn *numeric* first column into yearmon indexz <- read.zoo("foo.csv", sep = ",", FUN = as.yearmon)
## turn *character* first column into Date indexz <- read.zoo("foo.tab", format = "%m/%d/%Y")