How to solve this in matlab?

Hi,did someone know how to convert this equation in matlab?i know this is easy since matlab have build in function.but i cant figure it how to do that in matlab,still new in matlab..

?Xab.Kab

a=1...nth value

b=1...nth value

Xab = X in pattern a and pattern b

Kab = K in pattern a and pattern b

thanks.

[Matt Fig]

This question is very unclear. Solve for what? Give a short example which covers all cases encountered.

[Amir Hamzah UTeM]

i want to solve sum(Xab.Kab) that sum symbol cant view here.. :(

[Matt Fig]

So is Walter's solution what you are looking for? If not, and Paulo's is not either, please give a simple example, such as:

X = [2 3 4 8];

K = [7 5 6 9];

What do you want from these two vectors? Or do you need to work on arrays, such as:

X = [2 3; 4 8];

K = [7 5; 6 9];

Answer 1

[Paulo Silva]

%pre-allocate the vectors for Xab and Kab
Xab=zeros(1,na+nb-1);
Kab=0*Xab;
% can't decode this %?Xab.Kab
for a=1:na %a=1...nth value
    for b=1:nb %b=1...nth value
        Xab(a+b-1)=X; %Xab = X in pattern a and pattern b
        Kab(a+b-1)=K; %Kab = K in pattern a and pattern b
    end
end

Answer 2

[Walter Roberson]

I am not at all certain I am interpreting the question correctly, but possibly:

sum(X(:) .* K(:))

[Andrei Bobrov]

agree with Walter Roberson,"?Xab.Kab" - as a Maple matrix multiplication rtable - arrays...

[Walter Roberson]

sum of a matrix multiplication? Hmmm, possibly. The arrays are an acceptable shape for that.

sum(reshape(X*K,[],1))