Dear List, does anybody has experience with the RNetCDF package? I manage to open a connection and copy data from a ncdf file but would need a way to automatically retrieve variable names (ideally all of them from one file) and units from the file. Any ideas? Jannis
Hi Jannis,
although I don't know how you'd do that with RNetCDF, with the ncdf
package it's pretty easy:
ncid = open.ncdf( 'file.nc' )
nvars = ncid$nvars
for( ivar in 1:nvars )
print(paste("var number",ivar,"is named",
ncid$var[[ivar]]$name, "and
has units", ncid$var[[ivar]]$units ))
Regards,
--Dave
Jannis wrote:> Dear List,
>
>
> does anybody has experience with the RNetCDF package? I manage to open a
> connection and copy data from a ncdf file but would need a way to
> automatically retrieve variable names (ideally all of them from one file)
> and units from the file.
>
>
> Any ideas?
> Jannis
>
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
>
-------------------------------------------------------------------
David W. Pierce
Division of Climate, Atmospheric Science, and Physical Oceanography
Scripps Institution of Oceanography
(858) 534-8276 (voice) / (858) 534-8561 (fax) dpierce at ucsd.edu
There are a number of functions in the package to inquire about the
file contents. See library(help = RNetCDF).
For example:
library(RNetCDF)
nc <- open.nc("file.nc")
var.inq.nc(nc, 0)
$id
[1] 0
$name
[1] "longitude_U"
$type
[1] "NC_DOUBLE"
$ndims
[1] 1
$dimids
[1] 1
$natts
[1] 0
You can then read from the file with something like this:
obj0 <- var.inq.nc(nc, 0)
dat <- var.get.nc(nc, obj0$name, start = ...)
Going with ncdf or ncdf4 package is probably better ( I just happen to
be more familiar with RNetCDF.)
Cheers, Mike.
On Thu, Jan 13, 2011 at 9:00 AM, Jannis <bt_jannis at yahoo.de>
wrote:> Dear List,
>
>
> does anybody has experience with the RNetCDF package? I manage to open a
connection and copy data from a ncdf file but would need a way to automatically
retrieve variable names (ideally all of them from one file) and units from the
file.
>
>
> Any ideas?
> Jannis
>
>
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
--
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner at gmail.com