I have searched the code some time ago, but couldn't find it.
My case is like this.
I have a matrix. eg matrix A. I want to sum the elements of the matrix based on a pattern. The pattern I want is A (a, b) + A (b, g) + A (g, j) + .... So initially we select certain elements from A, for example A (a, b), with row a and column b.
Then the element we select will be added to the next element in the same row number as the column number of the previous element. for example in A (a, b) the column is b, then the next element b will be selected as the row, so that A (b, something from a-b is selected according to the matrix element).
so later there will be some addition 1. A (a, b) + A (b, c) 2. A (a, b) + A (b, d) 3. A (a, b) + A (b, e) etc
This is the example matrix
A = [1 2 3 4;
4 3 2 1;
5 2 3 1];
thankyou in advance