01_nc_open_par: Open a parallel NetCDF File
In pbdNCDF4: Programming with Big Data -- Interface to Parallel Unidata NetCDF4 Format Data Files

Description Usage Arguments Details Value Author(s) References See Also Examples

Opens an existing NetCDF file for reading (or, optionally, writing) in parallel.

1 2	nc_open_par(filename, write = FALSE, readunlim = TRUE, verbose = FALSE, comm = 0L, info = 0L)

`filename`	Name of the existing NetCDF file to be opened.
`write`	If FALSE (default), then the file is opened read-only. If TRUE, then writing to the file is allowed.
`readunlim`	When invoked, this function reads in the values of all dimensions from the associated variables. This can be slow for a large file with a long unlimited dimension. If set to FALSE, the values for the unlimited dimension are not automatically read in (they can be read in later, manually, using `ncvar_get`).
`verbose`	If TRUE, then messages are printed out during execution of this function.
`comm`	a communicator number from pbdMPI.
`info`	a info number from pbdMPI.

See nc_open details. The parallel version is able to coordinate with other nc_open_par instances for more efficient operation in parallel.

An object of class ncdf4 that has the fields described above.

George Ostrouchov, Pragneshkumar Patel pragnesh@utk.edu, Wei-Chen Chen, and Drew Schmidt.

Programming with Big Data in R Website: http://r-pbd.org/

nc_create_par, nc_var_par_access, ncdim_def, ncvar_def.

## Not run: 
### Under command mode, run the demo with 2 processors by
### (Use Rscript.exe for windows system)
mpiexec -np 2 Rscript -e "demo(ncwrite,'pbdNCDF4',ask=F,echo=F)"
mpiexec -np 2 Rscript -e "demo(ncread,'pbdNCDF4',ask=F,echo=F)"

## End(Not run)