MATLAB diagonal matrix

diag() command or function gives diagonal elements or creates a diagonal matrix, after reading this MATLAB diagonal matrix topic, you will know the theory and examples.

Syntax:

diag(n)

• n can be a vector or matrix.

Example: To create a 2×2 diagonal matrix having diagonal elements as 1 and 2.

n=[1,2];
diag(n)

Output:

ans =

1 0
0 2

Example: To create a column vector of diagonal elements from the given Matrix.

n=[1,2,3;3,2,1;4,5,1]

v=diag(n)

Output:

n =

     1     2     3
     3     2     1
     4     5     1


v =

     1
     2
     1