#!/usr/bin/python3
# -*- coding:utf-8 -*-


import csv
import math
import random
import sys


def create_bayes_nasty_data(filename):
    with open(filename, 'w') as f:
        writer = csv.writer(
            f, delimiter=('\t' if filename.endswith('.tsv') else ','))
        for i in range(100):
            x = random.uniform(-1.0, 1.0)
            y = random.uniform(-1.0, 1.0)
            p = abs(x-y) / abs(x+y)
            # for i in range(2):
            #     p = -2 * p**3 + 3 * p**2
            v = 1 if random.random() > p else 0
            writer.writerow([v, x, y])


if __name__ == '__main__':
    create_bayes_nasty_data(sys.argv[1])