How to see the current value of the variable in "fminsearch" optimization?

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I am running fminsearch command to find a minimum of a function. It is taking very long. However, I want to see the current value of the variable being serached. For example,"X=fminsearch(@fcn,init0,options)" showld display X in each interation. I looked into documentaiton of "optimset" but I couldn't find something helpful.
Advance, Thanks,

Respuesta aceptada

Alan Weiss
Alan Weiss el 23 de Jul. de 2020
You can do this using an Output Function. That example shows how to return the history of points, which is I think what you want.
Alan Weiss
MATLAB mathematical toolbox documentation
  1 comentario
Ahmed Rehan
Ahmed Rehan el 24 de Jul. de 2020
Thank you so much. This does the job. Based on this solution, I also tried disp() command in my function code, which also did the work.

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Más respuestas (1)

Vladimir Sovkov
Vladimir Sovkov el 23 de Jul. de 2020
From Matlab documentation:
'Display' Level of display
'notify' (default) | 'final' | 'off' | 'none' | 'iter'
Level of display, specified as the comma-separated pair consisting of 'Display' and one of these values:
  • 'notify' — Display output only if the function does not converge.
  • 'final' — Display just the final output.
  • 'off' or 'none' — Display no output.
  • 'iter' — Display output at each iteration (not available for lsqnonneg).
Display is available for all optimization solvers.
Example: options = optimset('Display','iter')
Data Types: char | string
  2 comentarios
Vladimir Sovkov
Vladimir Sovkov el 23 de Jul. de 2020
I do not think it is possible with fminsearch due to a (generally) multidimensional nature of the variable, which is hard to display in a compact form.
The things are easier with the 1D variable: this case you can use an alternative function such as fminbnd, which is able to output the X values at every next itereation via the same approach; besides, it must be faster in the 1D case.

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