Problem in using Function with in a function

2012 1 13
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I am writing a code to join two GUI blocks. In my code i have genereated matrices A, B, C and X based on the input. now i need to optimize A and B so i added an optimize function to it. But in the optimization i need to use X and C which are already generated in the above function. can any one help how i can declare X and C as global functions so that the optimization will take the same value what ever my first function is generating.

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Titus Edelhofer
Titus Edelhofer 2012-1-13

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Hi,
you don't need to use global variables. You can use anonymous functions to do so. If this is the function to be optimized:
function y = myobjective(AB, C, X)
% AB is the variable to be optimized, e.g.,
A = AB(1:5);
B = AB(6:10);
y = ...; % compute y with AB, C, X ...
Then in your function where you start the optimization:
C = ...; % compute C
X = ...; % compute X
% now build the objective function handle: C and X are "stored"
% in fun, so when called by optimizer, C and X are passed
fun = @(x) myobjective(x, C, X);
% call optimizer
x = fmincon(fun, ...);
Hope this helps,
Titus

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Srihari
Srihari 2012-1-16
Hi Titus,
now i have an another problem in declaring the function.
Imagine
fun(x_o,y_o)=(x,y)
since i am writing code for GUI
my matrix have angles which are given by the user
A=[cos(alpha)...(phi)];
B=[sin(alpha)....];
C=[...tau];
X = [fft(x);fft(y)];
Y =A*(C.*(B*X));
i will generate a valu P based on the output. Based on P i need to optimize alpha and phi.
so i need to use an other function where all the values are declared again and used for optimization.
Now the problem is i need to use the values of C and X which are generated by the first function.
I tried but i didnt able to generate the same values..please help me
Titus Edelhofer
Titus Edelhofer 2012-1-16
Sorry, but I don't quite understand the question...

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