[Tutor] pylab axis

[Mark Lawrence]

On 29/05/2014 17:12, Sydney Shall wrote:
> I would like to start by thanking all the tutors for their wonderful
> genourosity and excellent advice.
>
> My problem concerns forcing pylab to give me the y axis I want.
>
> My code is as follows:
>
> pylab.figure(10)
>
> pylab.title("Ratio of realised capital to advanced capital.")
>
> pylab.xlabel("Time [Cycles of Capital reproduction]")
>
> pylab.ylabel("Ratio of realised capital to advanced capital.")
>
> pylab.xlim = ((0.0, 1.5))
>
> pylab.plot(cycles, ratiocrtoca)
>
> pylab.show(10)
>
>
>   My pylab output is as follows:
>
>
> I regret I do not know how to put the pdf file in the message, so I have
> attached the pdf file of the graph. Please guide me on this too.
>
> My problem is that I wish to force the y axis to simply be from 0.0 to
> 1.5 without the detail which is just arithmetic noise, I think.
>
> With thanks,
>
> Sydney
>
> --
> Sydney Shall
>

The joys of the interactive prompt.

In [3]: help(pylab.ylim)
Help on function ylim in module matplotlib.pyplot:

ylim(*args, **kwargs)
     Get or set the *y*-limits of the current axes.

     ::

       ymin, ymax = ylim()   # return the current ylim
       ylim( (ymin, ymax) )  # set the ylim to ymin, ymax
       ylim( ymin, ymax )    # set the ylim to ymin, ymax

     If you do not specify args, you can pass the *ymin* and *ymax* as
     kwargs, e.g.::

       ylim(ymax=3) # adjust the max leaving min unchanged
       ylim(ymin=1) # adjust the min leaving max unchanged

     Setting limits turns autoscaling off for the y-axis.

     The new axis limits are returned as a length 2 tuple.

Aside, you appear to be using matplotlib in a strange way.  If your code 
is in a script, you'd use a line like this.

import matplotlib.pyplot as plt

If you're working interactively you'd use.

from pylab import *

You have a half way house.

Finally this mailing list is mainly aimed at people learning the Python 
language and not third party modules.  For matplotlib you can find a 
very helpful group here gmane.comp.python.matplotlib.general (and other 
places), I know they don't bite as I've been there :)

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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