Routines (alphabetical) > Routines: N > NCDF Routines > NCDF_OPEN

# NCDF_OPEN

The NCDF_OPEN function opens an existing NetCDF file.

## Syntax

Result = NCDF_OPEN( Filename [, /NOWRITE | , /WRITE] )

## Return Value

If successful, the NetCDF ID for the file is returned.

## Arguments

### Filename

A scalar string containing the name of the file to be opened.

## Keywords

### NOWRITE

Set this keyword to open an existing NetCDF file as read only. This is the default.

### WRITE

Set this keyword to open an existing NetCDF file for both writing and reading.

## Version History

Pre 4.0 | Introduced

## See Also

NCDF_ATTINQ