nonsingular(vmin, vmax, expander=0.001, tiny=1e-15, increasing=True)
The initial endpoints.
Fractional amount by which vmin and vmax are expanded if the original interval is too small, based on tiny.
Threshold for the ratio of the interval to the maximum absolute value of its endpoints. If the interval is smaller than this, it will be expanded. This value should be around 1e-15 or larger; otherwise the interval will be approaching the double precision resolution limit.
If True, swap vmin, vmax if vmin > vmax.
Endpoints, expanded and/or swapped if necessary. If either input is inf or NaN, or if both inputs are 0 or very close to zero, it returns -expander, expander.
Modify the endpoints of a range as needed to avoid singularities.
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