Python Inverse of a Matrix
Question: 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.


Answer: You should have a look at
[numpy](http://www.scipy.org/Tentative_NumPy_Tutorial) 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.
    

You can also have a look at the
[array](http://www.python.org/doc/2.5.2/lib/module-array.html) module, which
is a much more efficient implementation of lists when you have to deal with
only one data type.

