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/Matplotlib 3.1

matplotlib.axes.Axes.format_xdata

Axes.format_xdata(self, x)

Return x formatted as an x-value.

This function will use the fmt_xdata attribute if it is not None, else will fall back on the xaxis major formatter.

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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.axes.Axes.format_xdata.html