[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: nonlin_min function
From: |
steph |
Subject: |
RE: nonlin_min function |
Date: |
Thu, 23 Apr 2020 11:17:56 +0200 |
-----Original Message-----
From: Kai Torben Ohlhus <address@hidden>
Sent: Thursday, April 23, 2020 09:53
To: Steph Bredenhann <address@hidden>
Cc: address@hidden
Subject: Re: nonlin_min function
On 4/20/20 6:28 PM, Steph Bredenhann wrote:
> Dear Kai
>
> In the mean time I have read the manuals again and again and searched
> Google and I have made the suggested change to MaxFunEvals already,
> have now increased to 4000 as you suggest, see the options as I have it now.
>
> GPL_options =
>
> scalar structure containing the fields:
>
> AutoScaling = off
> ComplexEqn = off
> FunValCheck = off
> FinDiffType = forward
> Jacobian = off
> MaxFunEvals = 4000
> MaxIter = 1000
> OutputFcn = [](0x0)
> Updating = off
> TolFun = 0.0000000010000
> TolX = 0.0000000010000
> TypicalX = [](0x0)
>
> The outcome has now changed to:
>
> fsolve outcome: GPL_info = 3: improvement in objective function less
> than specified
>
> As you can see I have made TolFun and TolX very small.
>
> I have also changed my FUN to have a zero RHS as per the manual.
>
> It seems to me that the model I am investigating just don’t have a
> solution with this search algorithm.
>
> Thanks for your assistance, it is much appreciated.
>
> --
> */Steph /*
>
Dear Steph,
Can you attach the latest version of your m-files for debugging?
Thanks,
Kai
Dear Kai
m-files attached as requested.
I must just mention that, as the problem is intrinsically a curve fitting
problem I have also tried lsqcurvefit function with no improvement, as with
fsolve my "guess" must be very close to the real solution (which I have from
Excel) and then only 3-5 iterations are completed.
Looking forward to your feedback
Steph
fn_GPL_model.m
Description: Text document
call_script.m
Description: Text document
fn_BBR_GPL.m
Description: Text document
- nonlin_min function, Steph Bredenhann, 2020/04/05
- Re: nonlin_min function, Kai Torben Ohlhus, 2020/04/05
- Re: nonlin_min function, Steph Bredenhann, 2020/04/06
- Re: nonlin_min function, Steph Bredenhann, 2020/04/08
- Re: nonlin_min function, Kai Torben Ohlhus, 2020/04/20
- Re: nonlin_min function, Steph Bredenhann, 2020/04/20
- Re: nonlin_min function, Kai Torben Ohlhus, 2020/04/23
- RE: nonlin_min function,
steph <=