CALL CCG_COMB3x( NPIX, NLINES, STACK, VARS, COORDS, IMETH,
MINPIX, NITER, NSIGMA, ALPHA, RMIN, RMAX, RESULT, WIDTHS, COIND, WRK1, WRK2, POINT,
USED, NCON, NFLAG, STATUS )
NPIX = INTEGER (Given)
The number of
pixels in a line of data.
NLINES = INTEGER (Given)
The number of lines of data in the
stack.
STACK( NPIX, NLINES ) = ? (Given)
The array of lines which are to be combined
into a single line.
VARS( NLINES ) = ? (Given)
The variance to to used for each line
of data.
COORDS( NPIX, NLINES ) = ? (Given)
The co-ordinates along the collapse
axis for each pixel. It is accessed only for IMETH = 22, 23, 33, 34.
IMETH = INTEGER
(Given)
The method to use in combining the lines. It has a code of 1 to 300 which represent
the following statistics. 1 = Mean 2 = Weighted mean 3 = Median 4 = Trimmed mean 5
= Mode 6 = Sigma-clipped mean 7 = Threshold exclusion mean 8 = Minmax mean 9 =
Broadened median 10 = Sigma-clipped median 11 = Fast median 12 = Sum 13 = Standard
deviation about the mean 14 = Sigma-clipped standard deviation about the mean 21 =
Integrated value (sum of pixel co-ordinate width times value) 22 = Intensity-weighted
co-ordinate 23 = Intensity-weighted dispersion of the co-ordinate 24 = Root mean square 25 =
Absolute mean deviation 31 = Maximum 32 = Minimum 33 = Co-ordinate of maximum 34 =
Co-ordinate of minimum 35 = Number of good pixel values 36 = Number of bad pixel values
37 = Fraction of good pixel values 38 = Fraction of bad pixel values 300 = Median, but
estimating variance from mean variance
MINPIX = INTEGER (Given)
The minimum number
of pixels required to contribute to an output pixel.
NITER = INTEGER (Given)
The
maximum number of iterations (IMETH = 5).
NSIGMA = REAL (Given)
The number of
sigmas to clip the data at (IMETH = 5 and 6).
ALPHA = REAL (Given)
The fraction of
data values to remove from data (IMETH = 4).
RMIN = REAL (Given)
The minimum
allowed data value (IMETH = 7).
RMAX = REAL (Given)
The maximum allowed data
value (IMETH = 7).
RESULT( NPIX ) = ? (Returned)
The output line of data. This will
always be of type _INTEGER for methods 35 (NGOOD) and 36 (NBAD). Since this routine
does not actually access the array values, the mismatch in data types does not matter.
WIDTHS( NPIX, NLINES ) = ? (Returned)
The widths along the collapse axis for each
pixel. It is calculated only for IMETH = 21.
COIND( NPIX ) = INTEGER (Returned)
Workspace to hold co-ordinate indices.
WRK1( NLINES ) = ? (Returned)
Workspace for
calculations.
WRK2( NLINES ) = ? (Returned)
Workspace for calculations.
POINT(
NLINES ) = INTEGER (Returned)
Workspace to hold pointers to the original positions
of the data before extraction and conversion in to the WRK1 array.
USED( NLINES ) =
LOGICAL (Returned)
Workspace used to indicate which values have been used in estimating
a resultant value.
NCON( NLINES ) = DOUBLE PRECISION (Returned)
The actual
number of contributing pixels from each input line to the output line.
NFLAG = INTEGER
(Returned)
Number of output pixels set to bad because insufficient pixels were present to form
the statistic for the collapsed axis, provided the minimum number of contributing data
values is one.
STATUS = INTEGER (Given and Returned)
The global status.