Synchronize a NetCDF Dataset
Synchronize an open NetCDF dataset to disk.
sync.nc(ncfile)
ncfile |
Object of class " |
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.
Pavel Michna, Milton Woods
## 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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.