Per request my question is being resubmitted here.
I'm attempting to generate contour and a color map in Matplotlib ver. 1.4.3
on a MacBook Pro under Mac OS X ver. 10.10.2 in Python 2.7.3 with the
A zip file has been attached to this note. Two sub-directories,
mathplotlib_1.4.3 and mathplotlib_1.1.1rc are included.
mathplotlib_1.4.3 contains the python script that generates the contour and
color map plots, jpeg files showing the resultant plots and the input data.
mathplotlib_1.1.1rc contains the screen snaps (jpeg files) showing the
correct contour and color map plots generated by the same python script and
input data under Linux2 using Python 2.7.3 and Matplotlib 1.1.1rc.
The questions I have include:
1. What are the differences between Matplotlib vers. 1.1.1rc and 1.4.3?
Well, you just found one of them. You should be able to find most substantial changes in http://matplotlib.org/users/whats_new.html.
2. What is going on where?
The plt.axis('scaled') call is freezing the xlim and ylim at values resulting from a call to "nonsingular", which is handling the fact that when you call axis(), nothing has been plotted and there is no information about what you want the limits to be. In addition, 'scaled' is one of the axis options that turns off autoscaling. It has always been intended to be called *after* plotting with autoscaling on, or otherwise setting the xlim and ylim to the desired values. I don't know why it worked for you in 1.1.1rc; I think it was long before this that it had the behavior of turning off autoscaling, but I haven't checked.
3. How can I fix this problem?
Put the "plt.axis('scaled')" line after your pcolor or plot line.
As a side note, in general pcolormesh will yield the same result as pcolor, but *much* faster, so it is recommended in most cases.
On 2015/02/21 5:32 PM, Starfighter wrote:
View this message in context: http://matplotlib.1069221.n5.nabble.com/Problems-with-pyplot-and-cm-in-Matplotlib-ver-1-4-3-tp45002p45004.html
Sent from the matplotlib - users mailing list archive at Nabble.com.
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