Single figure with two axes

The pressure q[0] and q[1] are plotted on two sets of axes in a single figure.

Example generating data: $CLAW/doc/sphinx/example-acoustics-1d/README.html

Resulting plots: $CLAW/doc/sphinx/example-acoustics-1d/plots_3/_PlotIndex.html

#--------------------------
def setplot(plotdata):
#--------------------------

    """
    Specify what is to be plotted at each frame.
    Input:  plotdata, an instance of pyclaw.plotters.data.ClawPlotData.
    Output: a modified version of plotdata.

    """

    plotdata.clearfigures()  # clear any old figures,axes,items data

    plotfigure = plotdata.new_plotfigure(name='Solution', figno=1)

    # Pressure:

    # Set up for axes in this figure:
    plotaxes = plotfigure.new_plotaxes()
    plotaxes.axescmd = 'subplot(211)'
    plotaxes.xlimits = 'auto'
    plotaxes.ylimits = [-.5,1.1]
    plotaxes.title = 'Pressure'

    # Set up for item on these axes:
    plotitem = plotaxes.new_plotitem(plot_type='1d')
    plotitem.plot_var = 0
    plotitem.plotstyle = '-'
    plotitem.color = 'b'

    # Set up for second item on these axes:
    plotitem = plotaxes.new_plotitem(plot_type='1d')
    plotitem.plot_var = 0
    plotitem.plotstyle = 'o'
    plotitem.color = '#ff00ff'   # any color supported by matplotlib

    # Velocity:

    # Set up for second axes in this figure:
    plotaxes = plotfigure.new_plotaxes()
    plotaxes.axescmd = 'subplot(212)'
    plotaxes.xlimits = 'auto'
    plotaxes.ylimits = [-.5,.5]
    plotaxes.title = 'Velocity'

    # Set up for item on these axes:
    plotitem = plotaxes.new_plotitem(plot_type='1d')
    plotitem.plot_var = 1
    plotitem.plotstyle = 'o-'
    plotitem.color = 'b'

    # Parameters used only when creating html and/or latex hardcopy
    # e.g., via pyclaw.plotters.frametools.printframes:

    plotdata.printfigs = True                # print figures
    plotdata.print_format = 'png'            # file format
    plotdata.print_framenos = 'all'          # list of frames to print
    plotdata.print_fignos = 'all'            # list of figures to print
    plotdata.html = True                     # create html files of plots?
    plotdata.html_homelink = '../README.html'# pointer for index page
    plotdata.latex = True                    # create latex file of plots?
    plotdata.latex_figsperline = 1           # layout of plots
    plotdata.latex_framesperline = 2         # layout of plots
    plotdata.latex_makepdf = True            # also run pdflatex?

    return plotdata