MATLAB: Finding Indices of Elements Equal to 1 in a Matrix

This line of code in MATLAB will find all the indices in the matrix 'A' where the value is equal to 1 and store them in the matrix 'B'.

B = find(A==1)

This code utilizes the find function in MATLAB. The expression A==1 creates a logical matrix where elements equal to 1 are represented by 'true' and other elements are 'false'. The find function then returns the linear indices of all the 'true' elements in this logical matrix. These indices are then stored in the matrix 'B'.

For example, if A is:

A = [0 1 0; 1 0 1; 0 1 0];

Then, after executing B = find(A==1), B will be:

B = [2 4 6]

This indicates that the elements equal to 1 in A are located at indices 2, 4, and 6. This code is a useful tool for various tasks such as identifying specific elements in a matrix or extracting data based on a condition.