atan

(function from pyomo.contrib.fbbt.interval)

pyomo.contrib.fbbt.interval.atan(xl, xu, yl, yu)

y = atan(x); propagate bounds from x to y x = tan(y)

Parameters:

• xl (float)

• xu (float)

• yl (float)

• yu (float)

Returns:

• lb (float)

• ub (float)