MCordingley\Regression\Observations::fromArray PHP Method

    public static function fromArray(array $features, array $outcomes) : self
    {
        $observationCount = count($outcomes);
        if (count($features) !== $observationCount) {
            throw new InvalidArgumentException('Must have as many outcomes as observations.');
        }
        $observations = new self();
        for ($i = 0; $i < $observationCount; $i++) {
            $observations->add($features[$i], $outcomes[$i]);
        }
        return $observations;
    }

 public function testGetObservation()
 {
     $observations = Observations::fromArray(static::$features, static::$outcomes);
     $observation = $observations->getObservation(0);
     static::assertEquals(static::$features[0], $observation->getFeatures());
     static::assertEquals(static::$outcomes[0], $observation->getOutcome());
 }