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pylab_examples::set_and_get Namespace Reference


Detailed Description


matlab(TM) and pylab allow you to use setp and get to set and get
object properties, as well as to do introspection on the object

set
To set the linestyle of a line to be dashed, you can do

  >>> line, = plot([1,2,3])
  >>> setp(line, linestyle='--')

If you want to know the valid types of arguments, you can provide the
name of the property you want to set without a value

  >>> setp(line, 'linestyle')
      linestyle: [ '-' | '--' | '-.' | ':' | 'steps' | 'None' ]

If you want to see all the properties that can be set, and their
possible values, you can do

    >>> setp(line)

set operates on a single instance or a list of instances.  If you are
in quey mode introspecting the possible values, only the first
instance in the sequnce is used.  When actually setting values, all
the instances will be set.  Eg, suppose you have a list of two lines,
the following will make both lines thicker and red

    >>> x = arange(0,1.0,0.01)
    >>> y1 = sin(2*pi*x)
    >>> y2 = sin(4*pi*x)
    >>> lines = plot(x, y1, x, y2)
    >>> setp(lines, linewidth=2, color='r')


get:

get returns the value of a given attribute.  You can use get to query
the value of a single attribute

    >>> getp(line, 'linewidth')
        0.5

or all the attribute/value pairs

>>> getp(line)
    aa = True
    alpha = 1.0
    antialiased = True
    c = b
    clip_on = True
    color = b
    ... long listing skipped ...

Alisases:

  To reduce keystrokes in interactive mode, a number of properties
  have short aliases, eg 'lw' for 'linewidth' and 'mec' for
  'markeredgecolor'.  When calling set or get in introspection mode,
  these properties will be listed as 'fullname or aliasname', as in





Variables

tuple lines = plot(x, y1, x, y2)
tuple t = title('Hi mom')
tuple x = arange(0,1.0,0.01)
tuple y1 = sin(2*pi*x)
tuple y2 = sin(4*pi*x)


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