Usage
import(file = file.choose(), file.type = "csv",
sep = ",", header.at = 1, data.at = 2, date = "date",
date.format = "%d/%m/%Y %H:%M", time = NULL,
time.format = NULL, tz.in = "GMT", tz.out = "GMT",
na.strings = c("", "NA"), quote = """, ws = NULL,
wd = NULL, correct.time = NULL, ...)Arguments
file
The name of the file to be imported. Default,
file = file.choose(), opens browser.
Alternatively, the use of read.table (in
utils) also allows this to be a character vector
of a file path, connection or u
file.type
The file format, defaults to common
csv (comma delimited) format, but also allows
txt (tab delimited).
sep
Allows user to specify a delimiter if not
, (csv) or TAB (txt). For example ; is
sometimes used to delineate separate columns.
header.at
The file row holding header information
or NULL if no header to be used.
data.at
The file row to start reading data from.
When generating the data frame, the function will ignore
all information before this row, and attempt to include
all data from this row onwards.
date
Name of the field containing the date. This
can be a date e.g. 10/12/2012 or a date-time format e.g.
10/12/2012 01:00.
date.format
The format of the date. This is given
in R format according to strptime. For
example, a date format such as 1/11/2000 12:00
(day/month/year hour:minutes) is given the format
%d/%m/%Y %H:%M. See ex
time
The name of the column containing a time ---
if there is one. This is used when a time is given in a
separate column and date contains no information
about time.
time.format
If there is a column for time
then the time format must be supplied. Common examples
include %H:%M (like 07:00) or an integer
giving the hour, in which case the format is
%H. Again, see examples b
tz.in
The time zone of the data being read. Most
of the time this field can be ignored. However, one
situation where it is useful to supply tz.in is if
the original data considered daylight saving time i.e.
there is an hour missing in s
tz.out
The time zone of the output to be used by
openair functions.
na.strings
Strings of any terms that are to be
interpreted as missing (NA). For example, this
might be -999, or n/a and can be of
several items.
quote
String of characters (or character
equivalents) the imported file may use to represent a
character field.
ws
Name of wind speed field if present if
different from ws e.g. ws = "WSPD".
wd
Name of wind direction field if present if
different from "wd" e.g. wd = "WDIR".
correct.time
Numerical correction (in seconds) for
imported date. Default NULL turns this option
off. This can be useful if the hour is represented as 1
to 24 (rather than 0 to 23 assumed by R). In which case
correct.time = -3600
...
Other arguments passed to read.table.