This function is used to open a new data file for NCL.
function addfile (
file_path[ 1 ] : string,
status[ 1 ] : string
- Single string that is the full or relative path of the data file to load.
- Single string that specifies whether the file should be open as a read only
file or as a read-write file.
The addfile function returns a reference to the file pointed
to by the file_path argument. The file pointed to by the
file_path string must be a supported file format and have the supported
file extension at the end of its file name. For example, ".nc" and ".cdf" are
supported file extensions for the netCDF data format. The status
parameter can be either "r" for read only, "w" for read-write or "c" for
create. When "c" is set, the file is created if it doesn't exist. If it does
exist, an error message is printed and the default missing value for files
is returned. When "w" is set, the file exists and the permissions allow reading
and writing, and the file is opened for reading and writing. If any of these
conditions fail, an error message is reported and the default file missing
value is returned. Similarly, if "r" is set, the file must exist and
the user must have read permissions on that file; otherwise an error message
is printed and the default missing value is returned. See the ismissing function on how to detect
the returned missing value in a program.
(See Supported data
format information for a list of supported data formats,
the appropriate file extensions and other specific information
on each supported format.)
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$Revision: 1.12 $ $Date: 1998/06/15 21:28:54 $