fminsearch output size bigger than the variables to optimize?

Question

评论： Miguel Gómez Rubio 2023-3-5

So I'm trying to optimize some variables in a function with fminsearch, the code i wrote looks like this:

[solution] = fminsearch(@(parameters)NRTL_FO(T,x1,y1,P,ABC_C1,ABC_C2,parameters),[10000 1000 0,2]);

The beginning of the function NRTL_FO looks like this:

function [obj] = NRTL_FO(T,x1,y1,P,ABC_C1,ABC_C2,parameters)
g12_g22 = parameters(1);
g21_g11 = parameters(2);
alpha = parameters(3);
... 
...

so there are 3 parameters to optimize, but the result that i'm getting is this:

solution =
1.0e+03 *
2.1437   -0.7804   -0.0012    0.3405

Why am I getting a 1x4 size solution when the parameters that im optimizing are 3 ?

Hope you can help me, thanks.

Answer 1

Torsten 2023-3-5

[10000 1000 0.2]

instead of

[10000 1000 0,2]

as the vector of initial conditions.

MATLAB is not Excel.

that was definitely the problem, thanks