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>>>>> "Randy" == Randy Heiland <he...@in...> writes:

    Randy> I'm just playing with matplotlib inside IPython for my
    Randy> first time and want to do the equivalent of:

    Randy> In [1]: subplot(211) In [2]: plot([1,2,3]) In [3]: show()
    -> displays as expected, in the upper half

Use ipython in the pylab mode -- it will detect your backend and do
the right thing if threading is required, and will set the matplotlib
interactive state to be True.

 > ipython --pylab

It will also set you to be in interactive mode, and no use of "show"
is required -- see http://matplotlib.sf.net/interactive.html and
http://matplotlib.sf.net/faq.html#SHOW.  

    Randy> Now I want to interactively display a 2nd plot in the
    Randy> bottom, but when I do: In [4]: subplot(212)

    Randy> I get a new, single empty plot displayed in the lower half.
    Randy> Is there some 'hold' cmd I'm missing to do this?

In matplotlibrc -- http://matplotlib.sf.net/.matplotlibrc -- there is
an axes.hold parameter.  matplotlib ships with axes.hold : True by
default, so this should be your setting unless you changed it in a
past life.  It may be that the strangeness you are seeing vis-a-vis
subplot(212) stems from not using interactive mode properly in
conjunction with unsupported use of show, which should not be used in
interactive mode as explained in the FAQ.

You can query the current hold state with "ishold" and set it with "hold".
Notice in the following pylab interactive session I don't need to
import pylab as ipython does it for me; just make sure you're using a
recent version of ipython and matplotlib.

John-Hunters-Computer:~> ipython --pylab
Python 2.3 (#1, Sep 13 2003, 00:49:11) 
Type "copyright", "credits" or "license" for more information.

IPython 0.6.6 -- An enhanced Interactive Python.
?       -> Introduction to IPython's features.
%magic  -> Information about IPython's 'magic' % functions.
help    -> Python's own help system.
object? -> Details about 'object'. ?object also works, ?? prints more.

  Welcome to pylab, a matplotlib-based Python environment
    help(matplotlib) -> generic matplotlib information
    help(pylab)     -> matlab-compatible commands from matplotlib
    help(plotting)   -> plotting commands

In [1]: ishold()
Out[1]: True

In [2]: hold(False)

In [3]: ishold()
Out[3]: False

In [4]: 

I'm just playing with matplotlib inside IPython for my first time and want
to do the equivalent of:

In [1]: subplot(211)
In [2]: plot([1,2,3])
In [3]: show()
-> displays as expected, in the upper half
Now I want to interactively display a 2nd plot in the bottom, but when I do:
In [4]: subplot(212)

I get a new, single empty plot displayed in the lower half.
Is there some 'hold' cmd I'm missing to do this?

--Randy

Hi:

The first version of a map plotting module is available at 
http://www.cdc.noaa.gov/people/jeffrey.s.whitaker/python/basemap/

(Source code
http://www.cdc.noaa.gov/people/jeffrey.s.whitaker/python/basemap/basemap-20041229.tar.gz)

It's not nearly as fully featured as the the matlab mapping toolbox, nor does it have the same API - but it does provide some useful functions for plotting images and contour plots on mercator, lat/lon, lambert conformal and stereographic projections.  Plotting coastlines, countries boundaries and state boundaries in the Americas is supported.  Filling continents is supported, but filling ocean areas is not (yet).  There are also functions to plot selected parallels and meridians, as well as an interpolation function to regrid regularly spaced lat/lon data to a native map projection grid.  

In addition to numarray and matplotlib, the module requires proj (from http://proj.maptools.org).

Hope someone finds it useful - comments and suggestions are welcome.

-Jeff

-- 
Jeffrey S. Whitaker         Phone : (303)497-6313
NOAA/OAR/CDC  R/CDC1        FAX   : (303)497-6449
325 Broadway                Web   : http://www.cdc.noaa.gov/~jsw
Boulder, CO, USA 80305-3328 Office: Skaggs Research Cntr 1D-124