1.1.1.0 image.adddegaxes

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image.adddegaxes - Function

1.1.1 Add degenerate axes of the specified type to the image

Description

This method adds degenerate axes (i.e. axes of length 1) of the specified type. Sometimes this can be useful although you will generally need to modify the coordinate system of the added axis to give it the coordinate you want (do this with the Coordsys tool). This method supports both float and complex valued images.

You specify which type of axes you want to add. You can’t add an axis type that already exists in the image. For the Stokes axis, the allowed value (a string such as I, Q, XX, RR) can be found in the Coordsys newcoordsys function documentation.

If outfile is given, the image is written to the specified disk file. If outfile is unset, the on-the-fly Image tool returned by the function is associated with a temporary image. This temporary image may be in memory or on disk, depending on its size. When you destroy the generated Image tool (with the done function) this temporary image is deleted.

Arguments


Inputs
outfile	Output image file name. Default is unset.
	allowed:	string
	Default:
direction	Add direction axes?
	allowed:	bool
	Default:	false
spectral	Add spectral axis?
	allowed:	bool
	Default:	false
stokes	Add Stokes axis? Default is empty string.
	allowed:	string
	Default:
linear	Add linear axis?
	allowed:	bool
	Default:	false
tabular	Add tabular axis?
	allowed:	bool
	Default:	false
overwrite	Overwrite (unprompted) pre-existing output file?
	allowed:	bool
	Default:	false
silent	Skip silently existing axes?
	allowed:	bool
	Default:	false

Returns
image

Example

"""
#
print "\t----\t adddegaxes Ex 1 \t----"
ia.maketestimage()
print ia.shape()
#[113L, 76L]
mycs=ia.coordsys()
print mycs.axiscoordinatetypes()
#[’Direction’, ’Direction’]
mycs.done()
im2 = ia.adddegaxes(spectral=T)
print im2.shape()
#[113L, 76L, 1L]
mycs=im2.coordsys()
print mycs.axiscoordinatetypes()
[’Direction’, ’Direction’, ’Spectral’]
mycs.done()
im3 = im2.adddegaxes(stokes=’Q’)
print im3.shape()
#[113L, 76L, 1L, 1L]
mycs = im3.coordsys()
print mycs.axiscoordinatetypes()
#[’Direction’, ’Direction’, ’Spectral’, ’Stokes’]
mycs.done()
im2.done()
im3.done()
ia.close()
#
"""

In this example, all the images are virtual (temporary images).

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