listvis

listvis(vis, options='ap', datacolumn='data', field='', spw='*', selectdata=False, antenna='', timerange='', correlation='', scan='', feed='', array='', observation='', uvrange='', average='', showflags=False, pagerows=50, listfile='')[source]

List measurement set visibilities.

[Description] [Examples] [Development] [Details]

Parameters

  • vis (path) - Name of input visibility file

  • options (string=’ap’) - List options: ap only

  • datacolumn (string=’data’) - Column to list: data, float_data, corrected, model, residual

  • field (string=’’) - Field names or index to be listed

  • spw (string=’*’) - Spectral window channels

  • selectdata (bool=False) - Other data selection parameters

    selectdata = True

    • antenna (string=’’) - Antenna/baselines

    • timerange (string=’’) - Time range

    • correlation (string=’’) - Correlations

    • scan (string=’’) - Scan numbers

    • feed (string=’’) - Multi-feed numbers (Not yet implemented)

    • array (string=’’) - Array numbers (Not yet implemented)

    • observation ({string, int}=’’) - Select by observation ID(s)

    • uvrange (string=’’) - uv range

  • observation ({string, int}=’’) - Select by observation ID(s)

  • average (string=’’) - Averaging mode

  • showflags (bool=False) - Show flagged data (Not yet implemented)

  • pagerows (int=50) - Rows per page

  • listfile (string=’’) - Output file

Description

This task lists MeasurementSet visibility data under a number of input selection conditions. The MeasurementSet data columns that can be listed are: raw data, float_data, corrected data, model data,and residual (corrected - model) data.

The output table format is dynamic.The columns for field, spectral window, and channel are not displayed if the column contents are uniform. For example, if “spw = ‘1’ “ is specified, the spw column will not be displayed. When a column is not displayed, a message is sent to the logger and terminal indicating that the column values are uniform and listing the uniform value.

Table column descriptions:

Column Name

Description

Date/Time

Time stamp of data sample (YYMMDD/HH:MM:SS UT)

Intrf

Interferometer baseline (antenna names)

UVDist

uv-distance (units of wavelength)

Fld

Field ID (if more than 1 field)

SpW

Spectral Window ID (if more than 1 spectral window)

Chn

Channel number (if more than 1 channel)

(Correlated polarization)

Correlated polarizations (eg: RR, LL, XY). Sub-columns are: Amp, Phs, Wt, F

Amp

Visibility amplitude

Phs

Visibility phase (deg)

Wt

Weight of visibility measurement

F

Flag: ‘F’ = flagged datum; ‘ ‘ = unflagged

UVW

UVW coordinates (meters)

Parameter descriptions

vis

Name of input visibility file.

options

List options: default = ‘ap’. Not yet implemented for suboptions.

datacolumn

Visibility file data column. Options are ‘data’ (default), ‘float_data’, ‘corrected’, ‘model’, ‘residual’ (corrected-model).

field

Select data based on field id(s) or name(s). Example: field=’0~2’ includes field ids 0 to 2; field=’3C*’ includes all field names starting with 3C. Default is all fields.

spw

Select spectral windows and channels to list. Example: spw=’2:34~46’ includes channels 34 to 46 of spectral window 2. Default is all spws and channels.

selectdata

If selectdata=True, toggle the below 7 selection parameters. If selectdata=False, thefollowing parameters are reset to default values.

antenna

Select data based on antenna. For example: antenna = ‘5,6’ includes antenna index 5 and 6 solutions; antenna = ‘05,06’ includes antenna names ‘05’ and ‘06’ solutions.

timerange

Select time range to list. For example: timerange=’10:37:50.1’ lists data for this particular sampling interval; timerange=’<10:37:25’ list data before 10:37:25.

correlation

Select polarization correlations to list. For example: correlation=’RR LL’ list RR and LL correlations; correlation=’XX XY’ list XX and XY correlations.

scan

Select scans to list.For example: scan=’2’ lists scan 2; scan=’>2’ list scan numbers greater than 2.

feed (not yet implemented)

array (not yet implemented)

observation

Select by observation ID.

uvrange

Select baseline lengths to list. For example: uvrange=’<5klambda’ lists all data from baselines less than 5 kilo-wavelengths; uvrange=’500~1000m’ lists all data from baselines between 500m and 1000m.

Warning

CAUTION: Input units default to meters, but listed units are always wavelengths!

average (not yet implemented)

showflags (not yet implemented)

pagerows

Rows per page of listing. Default: 50; pagerows=0 means do not paginate.

listfile

Write output file to disk (will not overwrite). The default is to write to the screen.

Examples

To list the visibilities from the DATA column of a MeasurementSet, including all data from spectral windows 2 to 4 which have RR correlation:

listvis(vis='filename.ms', datacolumn='data', spw='2~4',
        selectdata=True, correlation='RR', pagerows=5,
        listfile='listfile.txt')

The visibilities are listed with 5 rows per page and written out in a text file called ‘listfile.txt’.

Development

No additional development details

Parameter Details

Detailed descriptions of each function parameter

vis (path) - Name of input visibility file
options (string='ap') - List options: ap only
datacolumn (string='data') - Column to list: data, float_data, corrected, model, residual
field (string='') - Field names or index to be listed
spw (string='*') - Spectral window channels
selectdata (bool=False) - Other data selection parameters
antenna (string='') - Antenna/baselines
timerange (string='') - Time range
correlation (string='') - Correlations
scan (string='') - Scan numbers
feed (string='') - Multi-feed numbers (Not yet implemented)
array (string='') - Array numbers (Not yet implemented)
observation ({string, int}='') - Select by observation ID(s)
uvrange (string='') - uv range
average (string='') - Averaging mode
showflags (bool=False) - Show flagged data (Not yet implemented)
pagerows (int=50) - Rows per page
listfile (string='') - Output file