MATLAB Change Matrix Values: Rows & Columns

To modify the values of specified rows and columns, you can use the assignment operator = to assign a new value to the specified element.

If we want to change the element in the second row and third column of matrix A to 5, we can use the following code:

A(2, 3) = 5;

In this case, A represents the name of the matrix to be modified, (2, 3) indicates the row and column index of the element to be modified, and 5 represents the new value to be assigned to that element.

If you need to change the values of multiple elements at the same time, you can use a similar method. For example, to change the first 3 elements of the first row in matrix A to 1, 2, and 3, you can use the following code:

A(1, 1:3) = [1, 2, 3];

In this case, A refers to the name of the matrix to be modified, (1, 1:3) indicates the range of row and column indexes of the elements to be modified, and [1, 2, 3] indicates the new values to be assigned to these elements.

It is important to note that indexing starts from 1, not 0. Additionally, the new value assigned to an element can be a specific number, or it can be a vector or matrix.