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NDF_NCHNK
- Determine the number of chunks of contiguous pixels in an NDF
- Description:
The routine determines the number of "chunks" (i.e. sections) of
contiguous pixels that can be obtained from an NDF, subject to
the constraint that no chunk should contain more than a specified
maximum number of pixels. More specifically, given the maximum
number of pixels in a chunk (MXPIX), this routine returns the
maximum value which can be supplied for the ICHUNK argument of
the routine NDF_CHUNK if a valid NDF identifier for a chunk of
contiguous pixels is to be returned.
- Invocation:
CALL NDF_NCHNK( INDF, MXPIX, NCHUNK, STATUS )
- Arguments:
-
INDF = INTEGER (Given)
-
NDF identifier.
-
MXPIX = INTEGER (Given)
-
Maximum number of contiguous pixels required in each chunk.
-
NCHUNK = INTEGER (Returned)
-
Number of chunks which can be obtained from the NDF.
-
STATUS = INTEGER (Given and Returned)
-
The global status.
- Notes:
-
This routine is provided to calculate an upper bound on the
number of chunks for DO-loops which process NDFs by dividing them
into separate chunks by means of calls to the routine NDF_CHUNK.
-
A value of zero will be returned for the NCHUNK argument if
this routine is called with STATUS set. The same value will also
be returned if the routine should fail for any reason.
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Up: FORTRAN ROUTINE DESCRIPTIONS
Previous: NDF_NBLOC - Determine the number of blocks of adjacent pixels in an NDF
Starlink User Note 33
R.F. Warren-Smith
11th January 2000
E-mail:rfws@star.rl.ac.uk
Copyright © 2000 Council for the Central Laboratory of the Research Councils