.. _pylab_examples-major_minor_demo1:

pylab_examples example code: major_minor_demo1.py
=================================================



.. plot:: /home/mandrake/rpm/BUILD/matplotlib-1.1.1/doc/mpl_examples/pylab_examples/major_minor_demo1.py

::

    #!/usr/bin/env python
    """
    Demonstrate how to use major and minor tickers.
    
    The two relevant userland classes are Locators and Formatters.
    Locators determine where the ticks are and formatters control the
    formatting of ticks.
    
    Minor ticks are off by default (NullLocator and NullFormatter).  You
    can turn minor ticks on w/o labels by setting the minor locator.  You
    can also turn labeling on for the minor ticker by setting the minor
    formatter
    
    Make a plot with major ticks that are multiples of 20 and minor ticks
    that are multiples of 5.  Label major ticks with %d formatting but
    don't label minor ticks
    
    The MultipleLocator ticker class is used to place ticks on multiples of
    some base.  The FormatStrFormatter uses a string format string (eg
    '%d' or '%1.2f' or '%1.1f cm' ) to format the tick
    
    The pylab interface grid command chnages the grid settings of the
    major ticks of the y and y axis together.  If you want to control the
    grid of the minor ticks for a given axis, use for example
    
      ax.xaxis.grid(True, which='minor')
    
    Note, you should not use the same locator between different Axis
    because the locator stores references to the Axis data and view limits
    
    """
    
    from pylab import *
    from matplotlib.ticker import MultipleLocator, FormatStrFormatter
    
    majorLocator   = MultipleLocator(20)
    majorFormatter = FormatStrFormatter('%d')
    minorLocator   = MultipleLocator(5)
    
    
    t = arange(0.0, 100.0, 0.1)
    s = sin(0.1*pi*t)*exp(-t*0.01)
    
    ax = subplot(111)
    plot(t,s)
    
    ax.xaxis.set_major_locator(majorLocator)
    ax.xaxis.set_major_formatter(majorFormatter)
    
    #for the minor ticks, use no labels; default NullFormatter
    ax.xaxis.set_minor_locator(minorLocator)
    
    show()
    

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