APMonitor

Global Options | Local Options

 Type: Floating Point, Input
 Default Value: 1.0e-6
 Description: Equation solution tolerance

RTOL is the error tolerance for reporting a successful solution where the residuals (r) of the equations (f(x)=r) are converged to nearly zero. A lower value of RTOL, such as 1e-8, will give a more precise answer but at the expense of more iterations. The default of 1e-6 is generally sufficient for most problems. However, there are times when the equation solution should be reported more precisely. Making RTOL too small may cause a bad solution to be reported because it surpasses the computer precision. RTOL and OTOL (tolerance for the objective function) should generally be adjusted together.

Python Gekko Example

See also OTOL, SOLVER