If I had to guess, you did not call nc_close or nc_sync. In netcdf, the data
is actually really written until that is called.
-Roy
On Aug 27, 2012, at 8:31 PM, Tom Roche wrote:
>
> 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 <Tom_Roche@xxxxxxxxx>
>
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**********************
"The contents of this message do not reflect any position of the U.S.
Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
"the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
