Regression\PowerRegression

Complexity

Total Complexity

7

Size/Duplication

Total Lines	51
Duplicated Lines	15.69 %

Coupling/Cohesion

Components	1
Dependencies	2

Importance

Changes

0

2 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	5	1
B	calculate()	8	36	6

<?php

namespace Regression;

/**
 * Class PowerRegression
 *
 * @package Regression
 * @author  robotomoze@gmail.com
 */
class PowerRegression extends AbstractRegression implements InterfaceRegression
{
    /**
     * ExponentialRegression constructor.
     */
    public function __construct()
    {
        $this->sumIndex = [0, 0, 0, 0];
        $this->dimension = \count($this->sumIndex);
    }

    /**
     * @throws RegressionException
     */
    public function calculate()
    {
        if ($this->sourceSequence === null) {
            throw new RegressionException('The input sequence is not set');
        }

        if (\count($this->sourceSequence) < $this->dimension) {
            throw new RegressionException('The dimension of the sequence of at least ' . $this->dimension);
        }

        $k = 0;

        foreach ($this->sourceSequence as $k => $v) {

This code seems to be duplicated across your project.

            if ($v[1] !== null) {
                $this->sumIndex[0] += \log($v[0]);
                $this->sumIndex[1] += \log($v[0]) * log($v[1]);
                $this->sumIndex[2] += \log($v[1]);
                $this->sumIndex[3] += \pow(\log($v[0]), 2);
            }
        }

        ++$k;

        $B = ($k * $this->sumIndex[1] - $this->sumIndex[2] * $this->sumIndex[0])
                / ($k * $this->sumIndex[3] - $this->sumIndex[0] * $this->sumIndex[0]);
        $A = \exp(($this->sumIndex[2] - $B * $this->sumIndex[0]) / $k);

        foreach ($this->sourceSequence as $i => $val) {
            $coordinate = [$val[0], $A * \pow($val[0], $B)];
            $this->resultSequence[] = $coordinate;
        }

        $this->equation = 'y = ' . \round($A, 2) . ' * x^' . \round($B, 2);

        $this->push();
    }
}