矩阵的 Python 逆矩阵 [英] Python Inverse of a Matrix

问题描述

如何在python中获得矩阵的逆?我自己实现了它，但它是纯 python 的，我怀疑有更快的模块可以做到这一点.

How do I get the inverse of a matrix in python? I've implemented it myself, but it's pure python, and I suspect there are faster modules out there to do it.

推荐答案

你应该看看 numpy 如果您进行矩阵操作.这是一个主要用C编写的模块，比用纯python编程要快得多.这是一个如何求逆矩阵和进行其他矩阵操作的示例.

You should have a look at numpy if you do matrix manipulation. This is a module mainly written in C, which will be much faster than programming in pure python. Here is an example of how to invert a matrix, and do other matrix manipulation.

from numpy import matrix
from numpy import linalg
A = matrix( [[1,2,3],[11,12,13],[21,22,23]]) # Creates a matrix.
x = matrix( [[1],[2],[3]] )                  # Creates a matrix (like a column vector).
y = matrix( [[1,2,3]] )                      # Creates a matrix (like a row vector).
print A.T                                    # Transpose of A.
print A*x                                    # Matrix multiplication of A and x.
print A.I                                    # Inverse of A.
print linalg.solve(A, x)     # Solve the linear equation system.

您还可以查看 array 模块，这是一个当您只需要处理一种数据类型时，列表的实现效率会更高.

You can also have a look at the array module, which is a much more efficient implementation of lists when you have to deal with only one data type.

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