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;

        }

        $this->equation = sprintf('y = %s + %s ln(x)', round($A, 2), round($B, 2));

        $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;

        }

        $this->equation = sprintf('y = %sx + %s', round($gradient, 1), round($intercept, 1));

        $A = exp(($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;

        }

        $this->equation = sprintf('y = %s+ e^(%sx)', round($A, 2), round($B, 2));