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| == Help on vishead task: ==
| | {{vishead}} |
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| <pre>
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| List, summary, get, and put metadata in a measurement set
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| This task allows the user to manipulate some meta-data parameters in a
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| measurement set. The mode='list' shows those keywords that are
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| presently implemented, with their values. The contents associated
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| with the keywords can be obtained (get) and changed (put).
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| The modes that are available are:
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| list --- List all keywords that are recognized, and list the
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| value(s) for each. Only these keywords can be obtained
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| (get) or changed (put)
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| summary --- Equivalent to running taskname='listobs'; verbose=F
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| get --- Get the specified keyword value(s) from the ms
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| put --- Put the specified keyword value(s) into the ms
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| Parameters currently implemented are (June 1, 2009):
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| cal_grp
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| field Field names
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| fld_code Field Observing codes
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| freq_group_name
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| log
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| observer Observer name
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| project Project name
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| ptcs Phase tracking centers for each field
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| release_date
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| schedule
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| schedule_type
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| spw_name Spectral parameters?
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| source_name Source Names (=Field Names?)
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| telescope Telescope Name
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| Keyword arguments:
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| vis --- Name of input visibility file
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| default: none, example: vis='my.ms'
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| mode --- Mode of operation for vishead
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| default = 'list'; example: mode='get'
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| hdkey--- keyword to get or put from the ms (used in get/put mode only)
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| ex: hdkey='telescope'
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| hdindex--- index (counting from 0) if keyword is an array (used in get/put
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| mode only)
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| hdkey--- keyword to get or put from the ms (used in get/put mode only)
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| ex: hdkey='telescope'
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| hdindex--- index (counting from 0) if keyword is an array (used in get/put
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| mode only)
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| ex: hdindex='2'; hdindex=''->put/get full array;
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| hdvalue --- value to be put in the MS (used in put mode only)
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| ex: hdvalue=array(['MyTelescope'])
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| Examples:
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| To transfer the parameters to useful python items requires some care.
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| taskname = 'vishead'
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| default()
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| vis = '3C84C.ms'
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| mode = 'get'
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|
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| to get a field name (string),
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| hdkey = 'field'; hdindex = '2'; hdvalue=vishead();
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| print hdvalue[0] = the name for field='2'
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| to get an phase center (number)
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| hdkey = 'ptcs'; hdindex = '1'; hdvalue = vishead();
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| hdvalue[0][0] gives the ra, hdvalue[0][1] gives the dec in field '1'
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| taskname = 'vishead'
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| default()
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| vis = '3C84C.ms'
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| mode = 'put'
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| To change a string,
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| hdkey = 'field'; hdindex = '2'; hdvalue = 'junk'; vishead()
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| field='2' is renamed 'junk'
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| To change a number, (egs. ra of field=1 to 0.5 radian)
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| is too complicated to figure out!
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| </pre>
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