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imagerpositiontest.set_imaging_parms - Function

	Package	synthesis
	Module	synthesistester
	Tool	imagerpositiontest

Set the parameters to be used for imaging.

Synopsis
set_imaging_parms(nx, ny, cellx, celly, stokes, doshift, phasecenter, shiftx, shifty, mode, nchan, start, step, facets)

Description
Set the parameters to be used for imaging. These parameters are passed to (p)imager.setimage() by make_image(). For the most part, you don't have to call this function unless you want to explicitly set some parameters; the correct thing will be done otherwise.

Arguments

nx		Number of pixels in the x direction.
		Allowed:	Integer > 0
		Default:	Unset. (determined by (p)imager.advise())
ny		Number of pixels in the y direction.
		Allowed:	Integer > 0
		Default:	Unset. (determined by (p)imager.advise())
cellx		Cell size in the x direction
		Allowed:	Qunatity (angle)
		Default:	Unset. (determined by (p)imager.advise())
celly		Cell size in the y direction
		Allowed:	Qunatity (angle)
		Default:	Unset. (determined by (p)imager.advise())
stokes		Stokes parameters to image
		Allowed:	String: 'I'|'IV'|'IQU'|'IQUV'
		Default:	Unset (will be set to 'I')
doshift		Use the specified phase center?
		Allowed:	Boolean
		Default:	Unset (will be set according to if the test is for a single field or multiple fields
phasecenter		Direction of phase center as a measure
		Allowed:	MDirection
		Default:	Unset (will be set if the the test is multi field)
shiftx		Shift in x
		Allowed:	Quantity (angle)
		Default:	'0arcsec'
shifty		Shift in y
		Allowed:	Quantity (angle)
		Default:	'0arcsec'
mode		Type of processing
		Allowed:	String: 'mfs'|'channel'|'velocity'
		Default:	'channel'
nchan		Number of channels
		Allowed:	Integer > 0
		Default:	Unset (will use number of channels in the simulated data set)
start		Starting channel
		Allowed:	0 > Integer >= number of channels in data set
		Default:	1
step		Step in channels
		Allowed:	Integer > 0
		Default:	1
facets		Number of facets on each axis
		Allowed:	Integer > 0
		Default:	Unset (determined by (p)imager.advise())

Returns
T

Example

- include 'imagerpositiontest.g';
- ipt := imagerpositiontest();
# set up a single field mem test and shift the phase center
- ipt.set_deconvolution_function('mem');
- ipt.set_sim_parms(nfields=1);
- ipt.set_mem_parms(algorithm='entropy',niter=25,sigma='0.1Jy');
- ipt.set_imaging_parms(shiftx='20arcsec',shifty='-10arcsec');
T
- ipt.dotests();