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| 1 | +<?php |
| 2 | + |
| 3 | +declare(strict_types=1); |
| 4 | + |
| 5 | +namespace PhpOffice\PhpSpreadsheetTests\Shared\Trend; |
| 6 | + |
| 7 | +use PhpOffice\PhpSpreadsheet\Exception as SpreadsheetException; |
| 8 | +use PhpOffice\PhpSpreadsheet\Shared\Trend\Trend; |
| 9 | +use PHPUnit\Framework\TestCase; |
| 10 | + |
| 11 | +class BestFitTest extends TestCase |
| 12 | +{ |
| 13 | + private const LBF_PRECISION = 1.0E-4; |
| 14 | + |
| 15 | + public function testBestFit(): void |
| 16 | + { |
| 17 | + $xValues = [45, 55, 47, 75, 90, 100, 100, 95, 88, 50, 45, 58]; |
| 18 | + $yValues = [15, 25, 17, 30, 41, 47, 50, 46, 37, 22, 20, 26]; |
| 19 | + $maxGoodness = -1000.0; |
| 20 | + $maxType = ''; |
| 21 | + |
| 22 | + $type = Trend::TREND_LINEAR; |
| 23 | + $result = Trend::calculate($type, $yValues, $xValues); |
| 24 | + $goodness = $result->getGoodnessOfFit(); |
| 25 | + if ($maxGoodness < $goodness) { |
| 26 | + $maxGoodness = $goodness; |
| 27 | + $maxType = $type; |
| 28 | + } |
| 29 | + self::assertEqualsWithDelta(0.9628, $goodness, self::LBF_PRECISION); |
| 30 | + |
| 31 | + $type = Trend::TREND_EXPONENTIAL; |
| 32 | + $result = Trend::calculate($type, $yValues, $xValues); |
| 33 | + $goodness = $result->getGoodnessOfFit(); |
| 34 | + if ($maxGoodness < $goodness) { |
| 35 | + $maxGoodness = $goodness; |
| 36 | + $maxType = $type; |
| 37 | + } |
| 38 | + self::assertEqualsWithDelta(0.9952, $goodness, self::LBF_PRECISION); |
| 39 | + |
| 40 | + $type = Trend::TREND_LOGARITHMIC; |
| 41 | + $result = Trend::calculate($type, $yValues, $xValues); |
| 42 | + $goodness = $result->getGoodnessOfFit(); |
| 43 | + if ($maxGoodness < $goodness) { |
| 44 | + $maxGoodness = $goodness; |
| 45 | + $maxType = $type; |
| 46 | + } |
| 47 | + self::assertEqualsWithDelta(-0.0724, $goodness, self::LBF_PRECISION); |
| 48 | + |
| 49 | + $type = Trend::TREND_POWER; |
| 50 | + $result = Trend::calculate($type, $yValues, $xValues); |
| 51 | + $goodness = $result->getGoodnessOfFit(); |
| 52 | + if ($maxGoodness < $goodness) { |
| 53 | + $maxGoodness = $goodness; |
| 54 | + $maxType = $type; |
| 55 | + } |
| 56 | + self::assertEqualsWithDelta(0.9946, $goodness, self::LBF_PRECISION); |
| 57 | + |
| 58 | + $type = Trend::TREND_BEST_FIT_NO_POLY; |
| 59 | + $result = Trend::calculate($type, $yValues, $xValues); |
| 60 | + $goodness = $result->getGoodnessOfFit(); |
| 61 | + self::assertSame($maxGoodness, $goodness); |
| 62 | + self::assertSame(lcfirst($maxType), $result->getBestFitType()); |
| 63 | + |
| 64 | + try { |
| 65 | + $type = Trend::TREND_BEST_FIT; |
| 66 | + Trend::calculate($type, $yValues, [0, 1, 2]); |
| 67 | + self::fail('should have failed - mismatched number of elements'); |
| 68 | + } catch (SpreadsheetException $e) { |
| 69 | + self::assertStringContainsString('Number of elements', $e->getMessage()); |
| 70 | + } |
| 71 | + |
| 72 | + try { |
| 73 | + $type = Trend::TREND_BEST_FIT; |
| 74 | + Trend::calculate($type, $yValues, $xValues); |
| 75 | + self::fail('should have failed - TREND_BEST_FIT includes polynomials which are not implemented yet'); |
| 76 | + } catch (SpreadsheetException $e) { |
| 77 | + self::assertStringContainsString('not yet implemented', $e->getMessage()); |
| 78 | + } |
| 79 | + |
| 80 | + try { |
| 81 | + $type = 'unknown'; |
| 82 | + Trend::calculate($type, $yValues, $xValues); |
| 83 | + self::fail('should have failed - invalid trend type'); |
| 84 | + } catch (SpreadsheetException $e) { |
| 85 | + self::assertStringContainsString('Unknown trend type', $e->getMessage()); |
| 86 | + } |
| 87 | + } |
| 88 | +} |
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