Add math module.

gklearn/utils/math.py

@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+"""
+Created on Wed Oct  7 14:43:36 2020
+
+@author: ljia
+"""
+
+def rounder(x, decimals):
+	"""Round, where 5 is rounded up.
+
+	Parameters
+	----------
+	x : float
+		The number to be rounded.
+	decimals : int
+		Decimals to which ``x'' is rounded.
+
+	Returns
+	-------
+	string
+		The rounded number.
+	"""
+	x_strs = str(x).split('.')
+	if len(x_strs) == 2:
+		before = x_strs[0]
+		after = x_strs[1]
+		if len(after) > decimals:
+			if int(after[decimals]) >= 5:
+				after0s = ''
+				for c in after:
+					if c == '0':
+						after0s += '0'
+					elif c != '0':
+						break
+				if len(after0s) == decimals:
+					after0s = after0s[:-1]
+				after = after0s + str(int(after[0:decimals]) + 1)[-decimals:]
+			else:
+				after = after[0:decimals]
+		elif len(after) < decimals:
+			after += '0' * (decimals - len(after))
+		return before + '.' + after
+
+	elif len(x_strs) == 1:
+		return x_strs[0]
+	
+	
+if __name__ == '__main__':
+	x = 1.0075333616
+	y = rounder(x, 2)
+	print(y)