[netcdfgroup] netcdf4 compound types and deflation

• To: netcdfgroup@xxxxxxxxxxxxxxxx
• Subject: [netcdfgroup] netcdf4 compound types and deflation
• From: Nick Johnson <Nick.Johnson@xxxxxxxx>
• Date: Fri, 03 Feb 2012 15:40:32 +0000

Hi,

I wanted to try some compression on a dataset whilst converting to netcdf4/hdf5 
to see if we can save some space.

I have my compound type defined as such:

if (nc_def_compound(grp2id, sizeof(struct elements), "sample_elements", 
&typeid))
    ERR(retval);
if (nc_insert_compound(grp2id, typeid, "elem", offsetof(struct elements, elem), 
NC_INT64))
    ERR(retval);
if (nc_insert_compound(grp2id, typeid, "type", offsetof(struct elements, type), 
NC_INT))
    ERR(retval);
if (nc_insert_compound(grp2id, typeid, "x", offsetof(struct elements, x), 
NC_INT))
    ERR(retval);
if (nc_insert_compound(grp2id, typeid, "y", offsetof(struct elements, y), 
NC_INT))
    ERR(retval);
if (nc_insert_compound(grp2id, typeid, "z", offsetof(struct elements, z), 
NC_INT))
    ERR(retval);


and then I call:
if ((retval = nc_def_var(grp2id, "data", typeid, 2, dimids, &varid2)))
    ERR(retval);

which works fine. If add in the following, before my call to nc_put_var:

if (retval = nc_def_var_deflate(ncid, varid2, 0, 1, 1))
    ERR(retval)

I get the error:
Error: NetCDF: Variable not found

which is odd as "varid2" is a legal variable id.


Any thoughts?


--
Nick Johnson, Applications Developer, EPCC
2407 JCMB, King's Buildings, Mayfield Road, Edinburgh, EH9 3JF
e: Nick.Johnson@xxxxxxxx t: 0131 651 3388

--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

• Follow-Ups:
  • Re: [netcdfgroup] netcdf4 compound types and deflation
    • From: Russ Rew