Data commit

Task/Pseudo-random-numbers-Splitmix64/Python/pseudo-random-numbers-splitmix64.py

@@ -0,0 +1,40 @@
+MASK64 = (1 << 64) - 1
+C1 = 0x9e3779b97f4a7c15
+C2 = 0xbf58476d1ce4e5b9
+C3 = 0x94d049bb133111eb
+
+
+
+class Splitmix64():
+
+    def __init__(self, seed=0):
+        self.state = seed & MASK64
+
+    def seed(self, num):
+        self.state =  num & MASK64
+
+    def next_int(self):
+        "return random int between 0 and 2**64"
+        z = self.state = (self.state + C1) & MASK64
+        z = ((z ^ (z >> 30)) * C2) & MASK64
+        z = ((z ^ (z >> 27)) * C3) & MASK64
+        answer = (z ^ (z >> 31)) & MASK64
+
+        return answer
+
+    def  next_float(self):
+        "return random float between 0 and 1"
+        return self.next_int() / (1 << 64)
+
+
+if __name__ == '__main__':
+    random_gen = Splitmix64()
+    random_gen.seed(1234567)
+    for i in range(5):
+        print(random_gen.next_int())
+
+    random_gen.seed(987654321)
+    hist = {i:0 for i in range(5)}
+    for i in range(100_000):
+        hist[int(random_gen.next_float() *5)] += 1
+    print(hist)