cdfGetFields: Gets a subset of groups fields in a CDF structure
Description
Gets a subset of groups fields in a CDF structure. This function is designed to be used with applyCdfGroups().
Usage
cdfGetFields(groups, fields, ...)
Value
Returns a list structure of groups.
Details
Note that an error is not generated for missing fields.
Instead the field is returned with value NA. The reason for this
is that it is much faster.