robotomize / regression-php

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

        foreach ($this->sourceSequence as $i => $val) {

            $coordinate = [$val[0], $A + $B * \log($val[0])];

            $this->resultSequence[] = $coordinate;

        }

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

        $A = \exp(($this->sumIndex[2] * $this->sumIndex[3] - $this->sumIndex[5] * $this->sumIndex[4]) / $denominator);

        $B = ($this->sumIndex[1] * $this->sumIndex[4] - $this->sumIndex[5] * $this->sumIndex[3]) / $denominator;

        foreach ($this->sourceSequence as $i => $val) {

            $coordinate = [$val[0], $A * \exp($B * $val[0])];

            $this->resultSequence[] = $coordinate;

        }

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

        $intercept = $this->sumIndex[1] / $k - $gradient * $this->sumIndex[0] / $k;

        foreach ($this->sourceSequence as $i => $val) {

            $coordinate = [$val[0], $val[0] * $gradient + $intercept];

            $this->resultSequence[] = $coordinate;

        }

        $this->equation = 'y = ' . \round($gradient, 1) . 'x + ' . \round($intercept, 1);