How to apply ax.margins to current axes limits?

[qAp]

Is there a way to use ax.margins to adjust the axes limits, after the axes limits have already been adjusted using ax.set_ylim? It appears that ax.margins has effect only if ax.set_ylim has not been used.

This notebook
http://nbviewer.jupyter.org/github/qap/offline_radiation_notebooks/blob/lblnew/longwave/lblnew_20160916/study__g1_threshold/n2o/band07_wn_1215_1380/P_50_T_250/4.e-21/matplotlib_axmargins.ipynb

describes a situation in which this need may arise.

Note: the y-axis is just an example, the same also applies to the x-axis (ax.set_xlim).

[efiring]

Please raise this question on matplotlib-users@python.org so there will be a wider collection of people available to reply, and more people potentially interested in the answer. We would like to keep github for bug reports and pull requests.