Re: [thredds] NetCDF Access failure with matlab and python

• To: thredds@xxxxxxxxxxxxxxxx
• Subject: Re: [thredds] NetCDF Access failure with matlab and python
• From: Thomas Cook <tmcook@xxxxxxxx>
• Date: Wed, 16 Jan 2019 18:04:34 -0800

HI I just wanted to add some details.

The functionality works when I downgraded to the docker container
4.6.12-SNAPSHOT

My data is part of a FMRC collection.

Thanks,
Tom

On Wed, Jan 16, 2019 at 4:51 PM Thomas Cook <tmcook@xxxxxxxx> wrote:
>
> HI
> I just yesterday updated my thredds-docker to 4.6.12 from
> 4.6.12-snapshot. It seems to be running fine, except I'm getting
> errors using matlab ncread and python netcdf4.dataset. When I try to
> access any of the multi-dimensional (time, lat, lon) variables I get
> the following errors
> with matlab:
> Error using netcdflib
> The NetCDF library encountered an error during execution of
> 'getVarsShort' function - 'Access failure (-77)'.
>
> Error in netcdf.getVar (line 136)
>     data = netcdflib(funcstr,ncid,varid,varargin{:});
>
> Error in internal.matlab.imagesci.nc/read (line 635)
>                 data  = netcdf.getVar(gid, varid, ...
>
> Error in ncread (line 58)
> vardata = ncObj.read(varName, varargin{:});
>
> Error in readUVfromTDS (line 56)
> u=ncread(url, 'u_mean', [1 1 1], [2 2 2]);
>
>
> and with python:
> netCDF4/_netCDF4.pyx in netCDF4._netCDF4.Variable.__getitem__()
>
> netCDF4/_netCDF4.pyx in netCDF4._netCDF4.Variable._get()
>
> netCDF4/_netCDF4.pyx in netCDF4._netCDF4._ensure_nc_success()
>
> RuntimeError: NetCDF: Access failure
>
> I know that the latest docker contains netcdf 4.6, where as the
> snapshot had 4.4. Could it be a version problem with the netCD4 python
> and matlab libraries? I should be running the latest netcdf python
> version and not too far behind with matlab versions.
>
> The weird things are that the index variables are accessible (time,
> lat, lon etc),  and the multiple-dimension data is accessible just
> fine using the OpenDap web interface and Panoply. So I'm a little
> confused. I'm addressing this list since I think there might be some
> matlab and python expertise here and I think there were some messages
> about the Access failure error in the past.
>
> Thanks,
> Tom

• Follow-Ups:
  • Re: [thredds] NetCDF Access failure with matlab and python
    • From: Sean Arms

• References:
  • [thredds] NetCDF Access failure with matlab and python
    • From: Thomas Cook