This application allows the
numeric type of the DATA and
VARIANCE components of an
NDF to be changed. The NDF is accessed in update mode
and the values stored in these components are converted in situ to the new
type. No other attributes of the NDF are changed.
COMPLEX = _LOGICAL (Read)
If a TRUE value is given for this
parameter, then the NDF’s array components will be altered so that they hold complex
values, an imaginary part containing zeros being created if necessary. If a
FALSE value is given, then the components will be altered so that they hold
non-complex values, any imaginary part being deleted if necessary. If a null (!)
value is supplied, the value used is chosen so that no change is made to the
current state. [!]
DATA = _LOGICAL (Read)
If a TRUE value is given for
this parameter, then the numeric type of the NDF’s data array will be changed.
Otherwise, this component’s type will remain unchanged. [TRUE]
NDF = NDF (Read
and Write)
The NDF data structure whose array components are to have their
numeric type changed.
The new numeric type to which
the NDF’s array components are to be converted. The value given should be one
of the following: _DOUBLE, _REAL, _INTEGER, _WORD, _UWORD, _BYTE or _UBYTE
(note the leading underscore). Existing pixel values stored in the NDF will not
be lost, but will be converted to the new type. Any values which cannot be
represented using the new type will be replaced with the
bad-pixel value.
VARIANCE = _LOGICAL (Read)
If a
TRUE value is given for this parameter, then the
numeric type of the NDF’s
VARIANCE array will be changed. Otherwise, this
component’s type will remain unchanged.
[TRUE] The execution time is approximately
proportional to the number of pixel values to be converted.