public NetCdfVariable AddVariable(string varName, Type type, NetCdfDimension[] ncDimensions)
{
int varId;
CheckResult(NetCdfWrapper.nc_def_var(id, varName, NetCdfWrapper.GetNetCdf3DataType(type), ncDimensions.Length,
ncDimensions.Select(d => (int)d).ToArray(), out varId));
var ncVar = new NetCdfVariable(varId);
// variable name is unique here, guaranteed by nc_def_var call above
ncVariableLookupByName.Add(varName, ncVar);
return(ncVar);
}