> > > > Does anyone knows why the default option for “contours” is > set to “(0,0)” in implicit_plot (sage/plot/contour_plot.py line 571-572)? > Instead of being left alone to “None”. > > I imagine that is what someone set it to long ago either in copying from something else or because it made things "look right" in some situation. If you try a wide variety of implicit plots with None and everything seems to be exactly the same, then this seems like a reasonable change. I don't know the history here, though (or I have forgotten it).
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