help how can I use the PSO algorithme for the case of a matrix ?!

Hello community,

I want to apply the PSO algirithme for a matrix, if someone have the matlab code or any idea or recommendation please

Thanks

Answer 1

[Stephan]

Hi,

you can use the reshape function and take advantage of the linear indexing in Matlab. This will allow to work with matrices too.

Best regards

Stephan

[Imane hammou ouali]

Could you be more explicit please !

[Stephan]

Could you provide more detailed informations about your problem? This would help being more explicit.

[Imane hammou ouali]

well , my objective function is a matrix , and i'm searching how can i return a maximum of this matrix with a constraint predefined.

[Stephan]

Perhaps this helps:

>> A = [1 2 3; 4 5 6; 7 8 9]

A =

     1     2     3
     4     5     6
     7     8     9

>> A(3)

ans =

     7
%-------------------------------------------------------------
>> B = reshape(A,1,[])

B =

     1     4     7     2     5     8     3     6     9

>> B(3)

ans =

     7
%-------------------------------------------------------------
>> C = reshape(B,3,3)

C =

     1     2     3
     4     5     6
     7     8     9
     
>> C(3)

ans =

     7

--> You can give an array of size 1xn to the objective function (this is what PSO will do) and then reshape it to size ixj to perform matrix calculations inside your objective function. This works because the linear indexing and is done easily using reshape. As long as your objective function returns a scalar value as result, this will work properly.