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用Python计算三角函数之atan()方法的使用

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Release： 2016-06-10 15:12:30
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 atan()方法返回x的反正切值，以弧度表示。
Syntax

以下是atan()方法的语法：

atan(x)

注意：此函数是无法直接访问的，所以我们需要导入math模块，然后需要用math的静态对象来调用这个函数。
参数

  •     x -- 这必须是一个数值。

返回值

此方法返回 x 的反正切值，以弧度表示。
例子

下面的例子显示atan()方法的使用。

#!/usr/bin/python
import math

print "atan(0.64) : ", math.atan(0.64)
print "atan(0) : ", math.atan(0)
print "atan(10) : ", math.atan(10)
print "atan(-1) : ", math.atan(-1)
print "atan(1) : ", math.atan(1)
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当我们运行上面的程序，它会产生以下结果：

atan(0.64) : 0.569313191101
atan(0) : 0.0
atan(10) : 1.4711276743
atan(-1) : -0.785398163397
atan(1) : 0.785398163397
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