Lapack::leastSquaresByFactorisation

(PECL lapack >= 0.1.0)

Calculate the linear least squares solution of a matrix using QR factorisation

public static array Lapack::leastSquaresByFactorisation ( array $a, array $b )

Solve the linear least squares problem, find min x in || B - Ax || Returns an array representing x. Expects arrays of arrays, and will return an array of arrays in the dimension B num cols x A num cols. Uses QR or LQ factorisation on matrix A.

Parameters:

Matrix A

Matrix B

Returns:

Array of the solution matrix

Examples:

Using Lapack::leastSquaresByFactorisation() :

<?php

 $a = array(
     array( 1.44,  -7.84,  -4.39,   4.53),
     array(-9.96,  -0.28,  -3.24,   3.83),
     array(-7.55,   3.24,   6.27,  -6.64),
     array( 8.34,   8.09,   5.28,   2.06),
     array( 7.08,   2.52,   0.74,  -2.47),
     array(-5.45,  -5.70,  -1.19,   4.70),
 );

 $b = array(
     array( 8.58,   9.35),
     array( 8.26,  -4.43),
     array( 8.48,  -0.70),
     array(-5.28,  -0.26),
     array( 5.72,  -7.36),
     array( 8.93,  -2.52),           
 );

 $result = Lapack::leastSquaresByFactorisation($a, $b);
 ?>

Links:

http://php.net/manual/en/lapack.leastsquaresbyfactorisation.php

doc_php

2016-02-24 16:02:24

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