.. _units-bar_demo2:

units example code: bar_demo2.py
================================



.. plot:: /home/mandrake/rpm/BUILD/matplotlib-1.1.1/doc/mpl_examples/units/bar_demo2.py

::

    """
    plot using a variety of cm vs inches conversions.  The example shows
    how default unit instrospection works (ax1), how various keywords can
    be used to set the x and y units to override the defaults (ax2, ax3,
    ax4) and how one can set the xlimits using scalars (ax3, current units
    assumed) or units (conversions applied to get the numbers to current
    units)
    
    """
    import numpy as np
    from basic_units import cm, inch
    from pylab import figure, show
    
    cms = cm *np.arange(0, 10, 2)
    bottom=0*cm
    width=0.8*cm
    
    fig = figure()
    
    ax1 = fig.add_subplot(2,2,1)
    ax1.bar(cms, cms, bottom=bottom)
    
    ax2 = fig.add_subplot(2,2,2)
    ax2.bar(cms, cms, bottom=bottom, width=width, xunits=cm, yunits=inch)
    
    ax3 = fig.add_subplot(2,2,3)
    ax3.bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=cm)
    ax3.set_xlim(2, 6)  # scalars are interpreted in current units
    
    ax4 = fig.add_subplot(2,2,4)
    ax4.bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=inch)
    #fig.savefig('simple_conversion_plot.png')
    ax4.set_xlim(2*cm, 6*cm) # cm are converted to inches
    
    show()
    

Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)