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Each variable in a CDF has a defined data specification. A variable's
data specification consists of a data
type and a number
of elements of that data type. A variable's data specification is specified
when the variable is created. The data specification of an existing
variable may also be changed
if either of the following conditions is true.
- Values have not yet been written to the variable (including an
explicitly written pad value --- see Section 2.3.17).
- The old data type and new data type are considered equivalent,
and the number of elements for the variable are the same. Equivalent data
types are described in Section 2.2.10.
cdfsupport@nssdca.gsfc.nasa.gov