rumus kurva

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Routing\Controller as BaseController;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Foundation\Auth\Access\AuthorizesRequests;

class Controller extends BaseController
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    public function linearNaik($a, $b, $x)
    {
        if ($x <= $a) {
            $result = 0;
        } else if ($x == $b) {
            $result = 1;
        } else if ($x >= $a && $x <= $b) {
            $result = ($x - $a)/($b - $a);
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function linearTurun($a, $b, $x)
    {
        if ($x >= $b) {
            $result = 0;
        } else if ($x >= $a && $x <= $b) {
            $result = ($b - $x)/($b - $a);
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function segitiga($a, $b, $c, $x)
    {
        if ($x <= $a || $x >= $c) {
            $result = 0;
        } else if ($x >= $a && $x <= $b) {
            $result = ($x - $a)/($b - $a);
        } else if ($x >= $b && $x <= $c) {
            $result = ($b - $x)/($c - $b);
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function trapesium($a, $b, $c, $d, $x)
    {
        if ($x <= $a || $x >= $d) {
            $result = 0;
        } else if ($x >= $a && $x <= $b) {
            $result = ($x - $a)/($b - $a);
        } else if ($x >= $b && $x <= $c) {
            $result = 1;
        } else if ($x >= $c && $x <= $d){
            $result = ($d - $x)/($d - $c);
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function bentukBahu($a, $b, $c, $d, $x)
    {
        if (($x >= 0 && $x <= $a) || ($x >= $c && $x <= $d)) {
            $result = 1;
        } else if ($x >= $a && $x <= $b) {
            $result = ($b - $x)/($b - $a);
        } else if ($x >= $b && $x <= $c) {
            $result = ($x - $b)/($c - $b);
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function sigmoidPertumbuhan($a, $b, $c, $x)
    {
        if ($x <= $a) {
            $result = 0;
        } else if ($x >= $a && $x <= $b) {
            $result = 2 * (pow(($x - $a), 2)/pow(($c - $a), 2));
        } else if ($x >= $b && $x <= $c) {
            $result = 1 - 2 * (pow(($x - $a), 2)/pow(($c - $a), 2));
        } else if ($x >= $c) {
            $result = 1;
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function sigmoidPenyusutan($a, $b, $c, $x)
    {
        if ($x <= $a) {
            $result = 0;
        } else if ($x >= $a && $x <= $b) {
            $result = 1 - 2 * (pow(($x - $a), 2)/pow(($c - $a), 2));
        } else if ($x >= $b && $x <= $c) {
            $result = 2 * (pow(($x - $a), 2)/pow(($c - $a), 2));
        } else if ($x >= $c) {
            $result = 1;
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function pi($a, $b, $c, $x)
    {
        if ($x <= $a && $x >= $c) {
            $result = 0;
        } else if ($x >= $b) {
            $result = 1;
        } else if ($x >= $a && $x <= $b) {
            $result = (1 - 2) * (($b - $x) / ($b - $a)) * (($b - $x) / ($b - $a));
        } else if ($x >= $b && $x <= $c) {
            $result = (2 * (($c - $x) / ($c - $b)) * (($c - $x) / ($c) - $b));
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function beta($a, $b, $c, $x)
    {
        if ($x <= $c) {
            $result = 2 * ($c - $b);
        } else if ($x > $c) {
            $result = 2 * (sqrt($c - $x) / ($c - $a));
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }

    public function gauss($a, $b, $c, $x)
    {
        if ($x <= $c) {
            $result = 2 * ($c - $b);
        } else if ($x > $c) {
            $result = 2 * (sqrt($c - $x) / ($c - $a));
        } else {
            $result = 'Input Salah';
        }

        return $result;
    }
}