Hello,
The following works fine for me:
> nc <- nc_open("~/GEIA_N2O_oceanic.nc")
> emi_n2o <- ncvar_get(nc, 'emi_n2o', start=c(1,1,1), count=c(-1,-1,1))
Regards,
Pascal
Le 28/08/2012 12:31, Tom Roche a écrit :
summary: I can successfully ncvar_put(...) data to a file, but when I
try to ncvar_get(...) the same data, I get
Error in if (nc$var[[li]]$hasAddOffset) addOffset = nc$var[[li]]$addOffset else
addOffset = 0 :
argument is of length zero
How to fix or debug?
details:
R code @
https://github.com/TomRoche/GEIA_to_NetCDF
successfully (if crudely) uses R packages={ncdf4, maps, fields} to
+ extract data from a GEIA-distributed datafile
https://github.com/downloads/TomRoche/GEIA_to_netCDF/N2OOC90Y.1A
+ display the data (mostly successfully--the map's legend has problems
which I'll attack later)
https://github.com/downloads/TomRoche/GEIA_to_netCDF/output.1.png
+ create a netCDF file using the data read from the GEIA file. (At
least, after nc_sync(netcdf.file), the file `ncdump -h`s properly.)
However, I can only *put* the data to the netCDF file:
ncvar_put(
+ nc=netcdf.file,
+ varid=emis.var,
+ vals=t(global.emis.mx),
+ start=c(1, 1, 1),
+ count=c(-1,-1, 1)) # -1 -> all data
When I try to *pull* the data *from* the netCDF I created,
target.data <- ncvar_get(
+ nc=netcdf.file,
+ varid=emis.var,
+ # read all the data
+ start=rep(1, emis.var$ndims),
+ # count=rep(-1, emis.var$ndims))
I get
Error in if (nc$var[[li]]$hasAddOffset) addOffset = nc$var[[li]]$addOffset else
addOffset = 0 :
argument is of length zero
And I get the same error if I try the minor variation(s)
target.data <- ncvar_get(
+ nc=netcdf.file,
+ # varid=emis.var,
+ varid=emis.var.name,
+ # read all the data
+ start=rep(1, emis.var$ndims),
+ count=c(-1, -1, 1))
But the data itself appears to be OK--at least, it virtualizes
properly (above). So I'm thinking I must just be missing something
simple, and hoping Someone Out There with fresh eyeballs can point to
my error(s).
(And, in case you're wondering:
- I'm not just ncvar_put'ing the data for the exercise: I want the
GEIA data in netCDF format for subsequent use.
- I tried to find the GEIA data distributed in netCDF format, and
asked around, but have gotten no responses.
) TIA, Tom Roche
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