Updated 6 Feb 2012
Fminsearch does not admit bound constraints.
However simple transformation methods exist to
convert a bound constrained problem into an
Fminsearchbnd is used exactly like fminsearch,
except that bounds are applied to the variables.
The bounds are applied internally, using a
transformation of the variables. (Quadratic for
single bounds, sin(x) for dual bounds.)
The bounds are inclusive inequalities, which admit
the boundary values themselves, but will not permit
ANY function evaluations outside the bounds.
Note that fminsearchbnd allows the user to exactly fix a variable at some given value, by setting both bounds to the exact same value.
rosen = @(x) (1-x(1)).^2 + 105*(x(2)-x(1).^2).^2;
% unconstrained fminsearch solution
% Lower bounds, no upper bounds
fminsearchbnd(rosen,[2.5 2.5],[2 2],)
Lower bounds on both vars, upper bound on x(2)
fminsearchbnd(rosen,[2.5 2.5],[2 2],[inf 3])
I've now included fminsearchcon in the package, a tool that also allows nonlinear constraints.
John D'Errico (2023). fminsearchbnd, fminsearchcon (https://www.mathworks.com/matlabcentral/fileexchange/8277-fminsearchbnd-fminsearchcon), MATLAB Central File Exchange. Retrieved .
MATLAB Release Compatibility
Platform CompatibilityWindows macOS Linux
- Mathematics and Optimization > Optimization Toolbox > Nonlinear Optimization >
- Mathematics and Optimization > Optimization Toolbox > Quadratic Programming and Cone Programming >
- Mathematics and Optimization > Optimization Toolbox > Systems of Nonlinear Equations >
Inspired: fitVirusCV19varW (Variable weight fitting of SIR Model), Ogive optimization toolbox, Fminspleas, fminsearchbnd new, Zfit, minimize, variogramfit, Total Least Squares Method, Accelerated Failure Time (AFT) models, Fit distributions to censored data, fminsearcharb, Matlab to Ansys ICEM/Fluent and Spline Drawing Toolbox
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!Start Hunting!
Discover Live Editor
Create scripts with code, output, and formatted text in a single executable document.