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(PECL lapack >= 0.1.0)
Lapack::eigenValues — This function returns the eigenvalues for a given square matrix
$a
[, array $left
[, array $right
]] )Calculate the eigenvalues for a square matrix, and optionally calculate the left and right eigenvectors.
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
Returns an array of arrays representing the eigenvalues for the array.
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 );
?>