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[netCDF #OAZ-263489]: NcVar class get method

Sue,

For 1- to 5-dimensional arrays, you can use the get method with the
appropriate number of edge-length arguments to match the
dimensionality of the netCDF variable.  But for any shape of array,
you can also use the more general get() method that has an array of
edge-lengths instead of one for each dimension.

So instead of

  var->get(vals, dim1, dim2 )

for a 2-dimensional array and

  var->get(vals, dim1, dim2, dim3 )

for a 3-dimensional array, you can use the more general

  var->get(vals, dims)

for an n-dimensional array, where dims is an array of the dimension
edge-lengths desired.

> I want to confirm that var->get(vals, 0, 0, dim1 , dim2) will fail to
> get the data properly.

If you try to specify more dimensions than the variable has, such as
using the above call for a 2-dimensional netCDF variable, you should
get an error from the library.  Are you checking the return value from
the get() method call?  If it's returning true in this case, that's a
bug we should fix.

> This means if you are a client parsing possibly 2D,3D, 4D etc data,
> you need to create a different get call for each case instead of
> having one get call with the various edge lengths equal to zero in
> the case of data with fewer dimensions.  This is what I am seeing.

No, you can use the overloaded n-dimensional version of the call for
all cases instead of the calls that assume a specific number of
dimensions.

--Russ

Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: OAZ-263489
Department: Support netCDF
Priority: Normal
Status: Closed