Lapack::eigenValues

(PECL lapack >= 0.1.0)

Lapack::eigenValues — This function returns the eigenvalues for a given square matrix

说明

public static array Lapack::eigenValues ( array $a [, array $left [, array $right ]] )

Calculate the eigenvalues for a square matrix, and optionally calculate the left and right eigenvectors.

参数

a: The matrix to calculate the eigenvalues for.
left: Optional parameter - if an array is passed here, it will be filled with the left eigenvectors
right: Optional parameter - if an array is passed here, it will be filled with the right eigenvectors

返回值

Returns an array of arrays representing the eigenvalues for the array.

范例

Example #1 Using Lapack::eigenValues() :

  <?php

 $a  = array(
     array(- 1.01 ,    0.86 ,  - 4.60 ,   3.31 ,  - 4.81   ),
     array(  3.98 ,    0.53 ,  - 7.04 ,   5.29 ,    3.55   ),
     array(  3.30 ,    8.26 ,  - 3.89 ,   8.20 ,  - 1.51   ),
     array(  4.43 ,    4.96 ,  - 7.66 , - 7.33 ,    6.18   ),
     array(  7.31 ,  - 6.43 ,  - 6.16 ,   2.47 ,    5.58   ),
 );

  $result  =  Lapack :: eigenValues ( $a );

  ?>