Re: [Matplotlib-users] Manually limiting value ranges

[Christian L. <li...@pe...>]

Hi,
the code given works for me in principle. If I run ipython without the
-pylab flag and do an

import * from pylab

at the start instead, I can run this code and it runs fine. (If not,
the plot() will imply the show and everything after that doesn't matter
any more.)

However, I'm now running into a new problem. I'm doing lots of separate
plots like that (hence the need for a fixed scale). To that end I run
the code in a loop which looks like 

for t in range(maxt):
    
    fig = p.figure(1)
    fig.clf()
    ax = fig.add_subplot(111)
    p.plot(pvar[t,ipos,:])
    p.plot(pvar[t,:,ipos])  

    ax = gca()
    ax.set_ylim(-10,10) #  
   
    filename = "%s-sliced%04d%s.png" % (var,t,dim)
    ptime = "%0.3f" % (timevar[t]/3600)
    p.title(var + ' at t=' + ptime + 'h')
    p.savefig(filename)
    p.clf()

Now, this will result in the error

  File "./swimplot-slice.py", line 63, in <module>
    ax.set_ylim(-10,10)
  File "/usr/lib/python2.5/site-packages/matplotlib/axes.py", line 2044, in set_ylim
    ymin = self.convert_yunits(ymin)
  File "/usr/lib/python2.5/site-packages/matplotlib/artist.py", line 111, in convert_yunits
    return ax.yaxis.convert_units(y)
  File "/usr/lib/python2.5/site-packages/matplotlib/axis.py", line 979, in convert_units
    self.converter = munits.registry.get_converter(x)
  File "//usr/lib/python2.5/site-packages/matplotlib/units.py", line 137, in get_converter
    converter = self.get_converter( thisx )
  File "//usr/lib/python2.5/site-packages/matplotlib/units.py", line
  137, in get_converter

With the last line being repeated for every iteration (so I assume). Then after
plenty of error messages like the last one above, I get

  File "//usr/lib/python2.5/site-packages/matplotlib/units.py", line 130, in get_converter
    if converter is None and iterable(x):
RuntimeError: maximum recursion depth exceeded

Where does this recursion come from? Do I have to clear something in each iteration
to avoid that? If so, how do I do that?

Cheers,
Christian


On Tue, 30 Dec 2008 07:31:57 -0800 (PST)
B Clowers <clo...@ya...> wrote:

> Christian,
> 
> The answer to your second question is a little more involved and I
> think there are a few posts regarding custom colormaps on the mailing
> list that may be of interest...I'd try searching through those.  I
> may not be the best person to answer that question.  
> 
> Also you may be interested in exploring the *kwargs vmin and vmax of
> the imshow command.  They may do what you need as well:
> 
> http://matplotlib.sourceforge.net/api/axes_api.html?highlight=imshow#matplotlib.axes.Axes.imshow
> 
> As for your first question try the following in ipython with the
> -pylab flag:
> 
> import numpy as N
> a = N.random.rand(50)
> a*=100
> plot(a)
> ax = gca()
> ax.set_xlim(0,25) #  The set_xlim and set_ylim may be what you're
> looking for... ax.set_ylim(0,50)
> show()
> 
> --- On Mon, 12/29/08, Christian Lerrahn <li...@pe...> wrote:
> From: Christian Lerrahn <li...@pe...>
> Subject: [Matplotlib-users] Manually limiting value ranges
> To: mat...@li...
> Date: Monday, December 29, 2008, 11:19 PM
> 
> Hi,
> I've been trying to do this for a while but just can't get it to
> work. :(
> 
> There are 2 things I want to do.
> 
> 1. I want to limit the value range in a line plot from
> matplotlib.pyplot.plot(). I thought that clip_box would do exactly
> that but setting something like [[-1,1],[-5,5]] or the like doesn't
> seem to have any effect.
> 
> 2. In a 2D map plot from matplotlib.pyplot.imshow(), I would like to
> set the limits for the colour bar manually. I.e. I want the colours to
> be equally distributed over a fixed range.
> 
> In both cases, the background to my attempt of using fixed values is
> that I'm producing a time series of plots via script and want all the
> plots to be directly comparable.
> 
> Did I overlook this in the examples (or the documentation) or is there
> really no simple way of doing this?
> 
> Cheers,
> Christian
> 
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