MATLAB: Sum of a function

equilibriumsum

Hello everyone, I am stucked on how to write particular code for a Nash-Cournout oligopolistic equilibrium problem. I have written everything correctly and it ran successfully. The only situation I am in presently is trying to vary a particular step. To be more precise

I need code for the following:

is random for every

and

is random for every

. I need to execute the following Quad program $c_j(x_j) = \frac{1}{2}x{_j}^{'} P_j x_j+ {q_j}^{'} x{_j}$. I will be glad if I can get a prompt help on this.

https://www.mathworks.com/matlabcentral/answers/uploaded_files/226241/Screenshot_20190625-093751.png

Thanks

Best Answer

The expression below should solve your problem. Also write questions properly -

would be scalar, so c is a vector. P and x are normal matrices, and q is a vector. This should solve your problem.

PS - Also update your question, and attach the image file there

c = x' * P * x / 2 + q' * x

Related Solutions

MATLAB: Obtaining a wrong matrix size

It is difficult to read your code and I can’t run it. I ran a simulation of the matrix operation you describe, and got a scalar result as expected.

I suggest you check the sizes of the matrices in your equation. One of your vectors may actually be a matrix.

MATLAB: Nested loop results in 3d matrix and plot3

Rajeev - why does your code define r as

 r=2.4:0.1:4;

and then overwrite the jth element on each iteration of the outer for loop with

 r(j)=2.4+j*.1;

This shouldn't be necessary since you have already defined r. As for saving the data to X, you can get a two-dimensional matrix/array as

 r=2.4:0.1:4;
 X = zeros(50,length(r));
 for j=1:length(r)
    X(1,j)=.5;
    for i=1:size(X,1)-1
        X(i+1,j)=r(j)*X(i,j)*(1-X(i,j));
    end
 end

In this case, X will be a 50x17 matrix. It isn't clear to me how you expect to get a 3D matrix from the above code, so please clarify.

As an aside, using i and j as your indexing variables is generally discouraged since MATLAB uses both to represent the imaginary number.

Best Answer

Related Solutions

MATLAB: Obtaining a wrong matrix size

MATLAB: Nested loop results in 3d matrix and plot3

Related Question