The subplot parameter

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3.3.2.8 The subplot parameter

The subplot parameter takes three numbers. The first is the number of y panels (stacking vertically), the second is the number of xpanels (stacking horizontally) and the third is the number of the panel you want to draw into. For example, subplot=212 would draw into the lower of two panels stacked vertically in the figure.

An example use of subplot capability is shown in Fig 3.6. These were drawn with the commands (for the top, bottom left, and bottom right panels respectively):

plotxy(’n5921.ms’,’channel’,     # plot channels for the n5921.ms data set
       field=’0’,                  # plot only first field
       datacolumn=’corrected’,     # plot corrected data
       plotcolor=’’,               # over-ride default plot color
       plotsymbol=’go’,            # use green circles
       subplot=211)                # plot to the top of two panels

plotxy(’n5921.ms’,’x’,           # plot antennas for n5921.ms data set
       field=’0’,                  # plot only first field
       datacolumn=’corrected’,     # plot corrected data
       subplot=223,                # plot to 3rd panel (lower left) in 2x2 grid
       plotcolor=’’,               # over-ride default plot color
       plotsymbol=’r.’)            # red dots

plotxy(’n5921.ms’,’u’,’v’,       # plot uv-coverage for n5921.ms data set
       field=’0’,                  # plot only first field
       datacolumn=’corrected’,     # plot corrected data
       subplot=224,                # plot to the lower right in a 2x2 grid
       plotcolor=’’,               # over-ride default plot color
       plotsymbol=’b,’)            # blue, somewhat larger dots
                                   # NOTE: You can change the gridding
                                   # and panel size by manipulating
                                   # the ny x nx grid.

Figure 3.6: Multi-panel display of visibility versus channel (top), antenna array configuration (bottom left) and the resulting uv coverage (bottom right). The commands to make these three panels respectively are: 1) plotxy(’ngc5921.ms’, xaxis=’channel’, datacolumn=’data’, field=’0’, subplot=211, plotcolor=’’, plotsymbol=’go’) 2) plotxy(’ngc5921.ms’, xaxis=’x’, field=’0’, subplot=223, plotsymbol=’r.’), 3) plotxy(’ngc5921.ms’, xaxis=’u’, yaxis=’v’, field=’0’, subplot=224, plotsymbol=’b,’,figfile=’ngc5921_multiplot.png’).

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See also § 3.3.2.3 above, and Figure 3.5 for an example of channel averaging using iteration and subplot.

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