1.3.2.0 msmetadata.refdir

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msmetadata.refdir - Function

1.3.2 Get the reference direction from a field ID and time if necessary

Description

Get a direction measure for the reference direction of the field and time specified

Arguments


Inputs
field	Zero-based field ID or field name for which to get the reference direction; default field=0
	allowed:	any
	Default:	variant 0
epoch	Optional time, expressed as a measures epoch dictionary, if associated field has a polynomial in time reference direction or an ephemerides table attached it. Default value means evaluate at the origin TIME in the FIELD table
	allowed:	record
	Default:

Returns
record

Example

    msmd.open("my.ms")
    # get reference direction for field ID 1
    mydir = msmd.refdir(1);
    # if the reference direction is a polynomial or has an ephemerides attached to
    # it a time is needed to get the reference direction
    ep=me.epoch(’utc’, ’2015/03/15/15:30:55’)
    mydir2=msmd.phasecenter(2, ep)
    msmd.done()

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