Syntax x = fmin('fun',x1,x2)

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work wolf
work wolf on 31 Aug 2016
Commented: Star Strider on 1 Sep 2016
Syntax
x = fmin('fun',x1,x2)
x = fmin('fun',x1,x2,options)
x = fmin('fun',x1,x2,options,P1,P2, ...)
[x,options] = fmin(...)
are not working by matlab? the message from matlab as follows as:
>> f =@(x) x.^3-2*x-5;
>> x = fmin('f', 0, 2)
Undefined function 'fmin' for input arguments of type 'char'.
Did you mean:
>> x = min('f', 0, 2)
Error using min
MIN with two matrices to compare and a working dimension is not supported.
>> x = fminbnd('f', 0, 2)
Cannot find an exact (case-sensitive) match for 'f'

Accepted Answer

Star Strider
Star Strider on 31 Aug 2016
You’re almost there.
This works:
f =@(x) x.^3-2*x-5;
x = fminbnd(f, 0, 2)
x =
816.4968e-003
  18 Comments
Star Strider
Star Strider on 1 Sep 2016
As always, my pleasure!

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More Answers (1)

Walter Roberson
Walter Roberson on 31 Aug 2016
"Note: The fmin function was replaced by fminbnd in Release 11 (MATLAB 5.3). In Release 12 (MATLAB 6.0), fmin displays a warning message and calls fminbnd."
If you are using MATLAB 5.3 or earlier, that is important information for us to know. If you are using something that old, you would use
x = fmin('f', 0, 2)
but you would also have to have created file f.m with content
function y = f(x)
y = x.^3-2*x-5;
  2 Comments
Steven Lord
Steven Lord on 31 Aug 2016
fmins -> fminsearch
fzero -> fzero

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