How to find eigenvalues ​​in matlab

How to find eigenvalues ​​in matlab?

Methods for finding the eigenvalues ​​and eigenvectors of a matrix

Methods/steps

In the first step, we first need to know what is used to calculate the eigenvalues ​​and eigenvectors of a matrix eig function, you can enter help eig in the command line window to check the usage of the eig function, as shown in the following figure:

The second step is to enter a in the command line window =[1 2 3;2 4 5;7 8 9], after pressing the Enter key, enter [x,y]=eig(a), as shown in the following figure:

In the third step, after pressing the Enter key, the values ​​of x and y are obtained. Each column value of x represents an eigenvector of the matrix a. There are 3 eigenvectors here. The diagonal element value of y represents the matrix a. The eigenvalues ​​of , as shown in the figure below:

Step 4 If we want to take the diagonal element value of y, we can use diag(y), as shown in the figure below:

In the fifth step, after pressing the Enter key, you can see that the diagonal element value of y has been taken out, which is the eigenvalue of the a matrix, as shown in the following figure:

In the sixth step, we can also help diag in the command line window, and you can see the usage of the diag function, as shown in the following figure:

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