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Topic: Reduce the number of fminsearch iterations
Replies: 2   Last Post: Oct 30, 2013 9:37 AM

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Steven Lord

Posts: 2,237
Registered: 9/26/13
Re: Reduce the number of fminsearch iterations
Posted: Oct 30, 2013 9:37 AM
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"Torsten " <> wrote in message
> "Sonia" wrote in message <l4qmda$50k$>...
>> Is it possible to make the fminsearch algorithm stop as soon as it
>> evaluates the objective function at a given x as zero?
>> I am optimizing for one variable and what happens is that the fminsearch
>> finds a point where the objective function f(x) = 0, but it continues to
>> iterate until the simplex is contracted around that value of x that gives
>> 0. I would like it to stop as soon as the fun(x)=0

> Use an output function to make fminsearch stop iterating:

Or use FZERO or FSOLVE (from Optimization Toolbox) to find a zero of your
function. FZERO will work if your objective function is a function of one
variable; use FSOLVE for functions of more than one variable.

If FZERO or FSOLVE indicate that they weren't able to find a zero of your
function, then you can switch to FMINSEARCH and let it go until it finds a
minimizer for your function.

Steve Lord
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