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Description:
This routine
determines floating-point axis indices within an axis array for a series of pixel co-ordinates. It assumes
that the array is monotonic and approximately linear, since it uses linear interpolation to derive
the pixel indices. This routine may be used for arbitrary 1-d arrays in addition to axes,
provided this criterion is met.
Invocation
CALL KPG1_AXCOx( LBND, UBND, AXIS, EL,
VALUE, INDEX, STATUS )
Arguments
LBND = INTEGER (Given)
The lower bound of
the axis array.
UBND = INTEGER (Given)
The upper bound of the axis array.
AXIS(
LBND:UBND ) = ? (Given)
The axis array.
EL = INTEGER (Given)
The number of indices
whose values in the axis array are to be found.
VALUE( EL ) = ? (Given)
The axis-array
values.
INDEX( EL ) = ? (Returned)
The pixel co-ordinates of the values in the axis
array. Notice that this is in floating point as fractional positions may be returned. An index
is set to the bad value when its input co-ordinate lies outside the range of co-ordinates
in the axis.
STATUS = INTEGER (Given and Returned)
The global status.
Notes:
-
There is a routine for the data types real or double precision: replace " x" in the routine name by R or
D respectively, as appropriate. The axis array and co-ordinates, and the returned indices should have
this data type as well.
-
An error report is made and bad status returned should any input co-ordinate lie outside the range of
co-ordinates of the axis. Processing will continue through the list.
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