1.1.3.0 coordsys.findcoordinate

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coordsys.findcoordinate - Function

1.1.3 Find axes of specified coordinate

Description

This function finds the axes in the Coordinate System for the specified coordinate (minimum match is active for argument type). By default it finds the first coordinate, but if there is more than one (can happen for linear coordinates), you can specify which. It returns a dictionary with ’return’, ’pixel’, and ’world’ as keys. The associated value of ’return’ is a boolean indicating if the specified coordinate was found. The values of ’pixel’ and ’world’ are arrays indicating the indices of the associated pixel and world axes, respectively, of the specified coordinate. If the coordinate does not exist, these arrays will be empty.

See also the function axesmap which returns the mapping between pixel and world axes.

Arguments


Inputs
type	Type of coordinate to find: direction, stokes, spectral, linear, or tabular
	allowed:	string
	Default:	direction
which	Which coordinate if more than one
	allowed:	int
	Default:	0

Returns
record

Example

"""
#
print "\t----\t findcoordinate Ex 1 \t----"
csys=cs.newcoordsys(direction=T)
rtn=cs.findcoordinate(’direction’)
print rtn
#{’world’: [0L, 1L], ’pixel’: [0L, 1L]}
print ’pixel, world axes =’, rtn[’pixel’], rtn[’world’]
#pixel, world axes = [0 1] [0 1]
#
"""

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