CODEWITHSUNDEEP
pythonmatplotlib
toscanelli
toscanelli

Reputation: 1241

Matplotlib interactive navigation zoom-to-rectangle button doesn't work

I have this Python code to plotting a figure:

matplotlib.rcParams['axes.unicode_minus'] = False
fig = plt.figure()
ax = fig.add_subplot(111)

I draw each plot running a loop along x and y like this:

ax.plot(x, y, dotFormat)
ax.errorbar(x, y, yerr=errorStd, fmt=dotFormat)

Finally, I set the axes and show the chart with the interactive navigation:

ax.grid(True)
ax.set_title(chartTitle)

fontsize=10

ax.set_ylabel(yLabel, fontsize=fontsize+2)
ax.set_xlabel(xLabel+'\n', fontsize=fontsize+2)

ax.set_yticklabels(ax.get_yticks(), fontsize=fontsize)
ax.set_xticks(range(len(xMinorLabels)), minor=True) 
ax.set_xticklabels(xMinorLabels, minor=True, rotation=90, fontsize=fontsize-5) 
ax.set_xticks(xMajorPosition, minor=False) 
ax.set_xticklabels(xMajorLabels, minor=False, rotation=90, fontsize=fontsize-4)

plt.show()

If I use the tool zoom-to-rectangle and the Y-axis doesn't work property, because the same dot before zooming in is under 5, and after zooming in it is over 5.

What is happening with the y-axis when I use the zoom tool? Is a bug in the interactive navigation of matplotlib library? Without this tool, the library is useless for huge charts.

Thanks in advance!

Upvotes: 0

Views: 1698

Answers (1)

tacaswell
tacaswell

Reputation: 87376

The problem is this

ax.set_yticklabels(ax.get_yticks(), fontsize=fontsize)

section. set_yticklabels sets the value of the tick independent of the data. That is the third tick will always be the third entry of what ever you passed in.

set_*ticklabels should be considered dangerous and only used in very specialized situations.

You can set the font size via ax.tick_params(...) doc, example

Upvotes: 1

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