np.copysign

Python math.copysign()方法 (Python math.copysign() method)

math.copysign() method is a library method of math module, it is used to get a number with the sign of another number, it accepts two numbers (either integers or floats) and returns a float value of the first number with the sign of the second number.

math.copysign()方法是数学模块的库方法，用于获取带有另一个数字的符号的数字，它接受两个数字(整数或浮点数)并返回带有符号的第一个数字的浮点值第二个数字。

Note: If anything is passed except the number, the method returns a type error, "TypeError: a float is required".

注意：如果传递了除数字以外的任何内容，则该方法将返回类型错误“ TypeError：需要浮点数”。

Syntax of math.copysign() method:

math.copysign()方法的语法：

    math.copysign(x, y)

Parameter(s): x, y – two numbers, x to be converted and y whose sign is required.

参数： x，y –两个数字， x是要转换的， y是需要符号的。

Return value: float – it returns a float value, that is x with the sign of y.

返回值： float-它返回一个浮点值，即x和y的符号。

Example:

例：

    Input:
a = 10
b = -2
# function call
print(math.copysign(a, b))
Output:
-10.0

Python代码演示math.copysign()方法的示例 (Python code to demonstrate example of math.copysign() method)

# Python code demonstrate example of
# math.copysign() method
import math
# numbers
a = 10
b = -2
print("copysign(a,b): ", math.copysign(a,b))
a = -10
b = -2
print("copysign(a,b): ", math.copysign(a,b))
a = 10.23
b = -2
print("copysign(a,b): ", math.copysign(a,b))
a = -10.23
b = -2.34
print("copysign(a,b): ", math.copysign(a,b))
a = -10
b = 2
print("copysign(a,b): ", math.copysign(a,b))

Output

输出量

copysign(a,b):  -10.0
copysign(a,b):  -10.0
copysign(a,b):  -10.23
copysign(a,b):  -10.23
copysign(a,b):  10.0

翻译自: https://www.includehelp.com/python/math-copysign-method-with-example.aspx

np.copysign