本文介绍了测试浮点平等的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

有一个函数来测试浮点近似相等在python吗?类似的东西,

Is there a function to test floating point approximate equality in python? Something like,

 def approx_equal(a, b, tol):
     return abs(a - b) < tol

我的用例类似于Google的C ++测试库gtest.h定义 EXPECT_NEAR

My use case is similar to how Google's C++ testing library, gtest.h, defines EXPECT_NEAR.

以下是一个示例:

def bernoulli_fraction_to_angle(fraction):
    return math.asin(sqrt(fraction))
def bernoulli_angle_to_fraction(angle):
    return math.sin(angle) ** 2
def test_bernoulli_conversions():
    assert(approx_equal(bernoulli_angle_to_fraction(pi / 4), 0.5, 1e-4))
    assert(approx_equal(
              bernoulli_fraction_to_angle(bernoulli_angle_to_fraction(0.1)),
                0.1, 1e-4))


推荐答案


  • 对于测试数字,有 nose.tools.assert_almost_equal 和等价的 unittest.assertAlmostEqual

  • 对于测试数字或数组,有 numpy.testing.assert_allclose

  • 数字, math.isclose 按,因为Python 3.5。

  • 对于比较数字或数组,有 numpy.allclose li>

    • For testing numbers, there are nose.tools.assert_almost_equal and equivalently unittest.assertAlmostEqual
    • For testing numbers or arrays, there is numpy.testing.assert_allclose
    • For comparing numbers, there is math.isclose as per PEP 485 since Python 3.5.
    • For comparing numbers or arrays, there is numpy.allclose.
    • 这篇关于测试浮点平等的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-15 18:00