NewtonRaphson::run() - Code Metrics - Inspection of "Refactored newton to be more generic" - Nyholm/effective-interest-rate - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( a3da9c...ba4a7f )

by Tobias

created 2017-04-03 09:06 UTC

NewtonRaphson::run() A

↳ Parent: NewtonRaphson

Complexity

Conditions	2
Paths	1

Size

Total Lines	11
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	11
rs	9.4285
c	0
b	0
f	0
cc	2
eloc	8
nc	1
nop	3

<?php

namespace Nyholm\EffectiveInterest;

/**
 * Newton-Raphsons method to do a numerical analysis to find the effective interest.
 *
 * {@link https://en.wikipedia.org/wiki/Newton%27s_method}
 *
 * @author Tobias Nyholm <[email protected]>
 */
class NewtonRaphson
{
    /**
     * @var int
     */
    private $precision;

    /**
     * @param int $precision
     */
    public function __construct(int $precision = 7)
    {
        $this->precision = $precision;
    }

    /**
     * @param callable $fx
     * @param callable $fdx
     * @param float $guess
     *
     * @return float
     */
    public function run(callable $fx, callable $fdx, float $guess): float
    {
        $newValue = $guess;
        $errorLimit = pow(10, -1 * $this->precision);
        do {
            $previousValue = $newValue;
            $newValue = $previousValue - ($fx($previousValue) / $fdx($previousValue));
        } while (abs($newValue - $previousValue) > $errorLimit);

        return $newValue * 12;
    }
}


1			<?php
2
3			namespace Nyholm\EffectiveInterest;
4
5			/**
6			* Newton-Raphsons method to do a numerical analysis to find the effective interest.
7			*
8			* {@link https://en.wikipedia.org/wiki/Newton%27s_method}
9			*
10			* @author Tobias Nyholm <[email protected]>
11			*/
12			class NewtonRaphson
13			{
14			/**
15			* @var int
16			*/
17			private $precision;
18
19			/**
20			* @param int $precision
21			*/
22			public function __construct(int $precision = 7)
23			{
24			$this->precision = $precision;
25			}
26
27			/**
28			* @param callable $fx
29			* @param callable $fdx
30			* @param float $guess
31			*
32			* @return float
33			*/
34			public function run(callable $fx, callable $fdx, float $guess): float
35			{
36			$newValue = $guess;
37			$errorLimit = pow(10, -1 * $this->precision);
38			do {
39			$previousValue = $newValue;
40			$newValue = $previousValue - ($fx($previousValue) / $fdx($previousValue));
41			} while (abs($newValue - $previousValue) > $errorLimit);
42
43			return $newValue * 12;
44			}
45			}
46

Nyholm / effective-interest-rate

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NewtonRaphson::run() A

Complexity

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