Dev algorithm (#55)

* feat: menambahkan integral

* feat: menambahkan integral

* feat: menambahkan integral

OpenSeries/matematika.py

@@ -1,6 +1,6 @@
 from OpenSeries.util import constant as constant
 from OpenSeries.util import error as error
-from typing import Union, Sequence
+from typing import Union, Sequence, Callable
 import numpy as np
 import math
 
@@ -522,3 +522,28 @@ def gaussian(
         / np.sqrt(2 * constant.PI * sigma**2)
         * np.exp(-((x - mu) ** 2) / (2 * sigma**2))
     )
+
+
+def integral(
+    f: Callable[[float], float], a: int, b: int, iterasi: int = 4
+) -> Union[float, error.ErrorTipeData]:
+    """
+    integral merupakan suatu konsep yang merupakan operasi kebalikan dari diferensiasi.
+    Integral memiliki dua bentuk utama: integral tak tentu (indefinite integral)
+    dan integral tentu (definite integral).
+    Args:
+        f (Callable[[float],float]): fungsi input
+        a (float): nilai awal
+        b (float): nilai atas
+        iterable (int, optional): mengatur putaran. Defaults to 4.
+
+    """
+    if not all(isinstance(data, (int)) for data in [a, b]):
+        return error.ErrorTipeData(["int"])
+    if not isinstance(iterasi, int):
+        return error.ErrorTipeData(["int"])
+    delta = (b - a) / iterasi
+    result = 0.5 * (f(a) + f(b))
+    for i in range(1, iterasi):
+        result += f(a + i * delta)
+    return round(result * delta)

testing/main_test.py

@@ -16,6 +16,7 @@
     TestSigmoid,
     TestDistribusiBinomial,
     TestGaussian,
+    TestIntegral,
 )
 
 from testing.fisika_test import (
@@ -54,6 +55,7 @@
         TestSigmoid,
         TestDistribusiBinomial,
         TestGaussian,
+        TestIntegral,
     ]
 
     testing_fisika: list = [

testing/matematika_test.py

@@ -252,3 +252,36 @@ def test_data_valid_input(self):
         ekspetasi_nilai = 0.12098536225957168
         hasil = matematika.gaussian(x, mu, sigma)
         self.assertAlmostEqual(hasil, ekspetasi_nilai, places=10)
+
+
+class TestIntegral(unittest.TestCase):
+    def test_nilai_integral(self):
+        def f(x):
+            return x * x
+
+        a = 0
+        b = 3
+        hasil = matematika.integral(f, a, b)
+
+        self.assertAlmostEqual(hasil, 9.00, places=2)
+
+    def testing_tipe_input_data_string(self):
+        def f(x):
+            return x * x
+
+        a = "0"
+        b = "3"
+        hasil = matematika.integral(f, a, b)
+        with self.assertRaises(error.ErrorTipeData):
+            raise hasil
+
+    def testing_tipe_iterasi_string(self):
+        def f(x):
+            return x * x
+
+        a = 0
+        b = 3
+        iterasi = "4"
+        hasil = matematika.integral(a, b, iterasi)
+        with self.assertRaises(error.ErrorTipeData):
+            raise hasil