sync.nc: Synchronize a NetCDF Dataset

In RNetCDF: Interface to 'NetCDF' Datasets

Synchronize a NetCDF Dataset

Description

Synchronize an open NetCDF dataset to disk.

Usage

sync.nc(ncfile)

Arguments

ncfile

Object of class NetCDF which points to the NetCDF dataset (as returned from open.nc).

Details

This function offers a way to synchronize the disk copy of a NetCDF dataset with in-memory buffers. There are two reasons one might want to synchronize after writes: To minimize data loss in case of abnormal termination, or to make data available to other processes for reading immediately after it is written.

Author(s)

Pavel Michna, Milton Woods

References

https://www.unidata.ucar.edu/software/netcdf/

Examples

##  Create a new NetCDF dataset and define two dimensions
file1 <- tempfile("sync_", fileext=".nc")
nc <- create.nc(file1)

dim.def.nc(nc, "station", 5)
dim.def.nc(nc, "time", unlim=TRUE)

##  Create two variables, one as coordinate variable
var.def.nc(nc, "time", "NC_INT", "time")
var.def.nc(nc, "temperature", "NC_DOUBLE", c(0,1))

##  Define variable values
mytime <- c(1:2)
dim(mytime) <- c(2)
mytemp <- c(0.0, 1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9)
dim(mytemp) <- c(5,2)

##  Put the data
var.put.nc(nc, "time", mytime)
var.put.nc(nc, "temperature", mytemp)

##  Synchronize to disk
sync.nc(nc)

##  Open a new connection to the dataset and read data:
nc2 <- open.nc(file1)
newtime <- var.get.nc(nc2, 0)
newtemp <- var.get.nc(nc2, "temperature")
stopifnot(all.equal(newtime,mytime))
stopifnot(all.equal(newtemp,mytemp))

close.nc(nc)
close.nc(nc2)
unlink(file1)

RNetCDF documentation built on May 29, 2024, 2:41 a.m.