numpy展平数组ndarray.flatten()详解
作者:大Py
这篇文章主要介绍了numpy展平数组ndarray.flatten()详解,具有很好的参考价值,希望对大家有所帮助。如有错误或未考虑完全的地方,望不吝赐教
numpy展平数组ndarray.flatten()
ndarray.flatten(order=‘C')
复制原数组,并将其展平成一维数组返回。
Params:
order : {‘C’, ‘F’, ‘A’, ‘K’},可选任意一个,默认是‘C’。
- C:行为主要顺序,从左至右,从上至下
- F:列为主要顺序,从上至下,从左至右
举例,原始数组:
arr = np.arange(9).reshape(3,3) arr array([[0, 1, 2], [3, 4, 5], [6, 7, 8]])
按‘C’风格展平:
arr.flatten() array([0, 1, 2, 3, 4, 5, 6, 7, 8])
按’F’风格展平:
arr.flatten('F') array([0, 3, 6, 1, 4, 7, 2, 5, 8])
numpy.ndarray实现扁平化numpy.ndarray.flatten
numpy.ndarray.flatten(order=‘C')
官方链接
把多维数组"扁平化"为一个一维向量,其过程是把该数组按照order指定的顺序遍历一遍,并把结果储存为一维向量.
Parameters order {‘C', ‘F', ‘A', ‘K'}, optional ‘C' (Default) means to flatten in row-major (C-style) order. ‘F' means to flatten in column-major (Fortran- style) order. ‘A' means to flatten in column-major order if a is Fortran contiguous in memory, row-major order otherwise. ‘K' means to flatten a in the order the elements occur in memory. The default is ‘C'.
示例
a = np.array([[1,2], [3,4]]) print(a.flatten())
结果
[1 2 3 4]
相当于
print(a.reshape(1,a.size))
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持脚本之家。