How to solve homogeneous linear equations with NumPy?

Question

If I have homogeneous linear equations like this

array([[-0.75,  0.25,  0.25,  0.25],
       [ 1.  , -1.  ,  0.  ,  0.  ],
       [ 1.  ,  0.  , -1.  ,  0.  ],
          


        

Answer 1

You can use an SVD or a QR decomposition to compute the null space of the linear system, e.g., something like:

import numpy

def null(A, eps=1e-15):
    u, s, vh = numpy.linalg.svd(A)
    null_space = numpy.compress(s <= eps, vh, axis=0)
    return null_space.T

This yields for your example:

>>> A
matrix([[-0.75,  0.25,  0.25,  0.25],
        [ 1.  , -1.  ,  0.  ,  0.  ],
        [ 1.  ,  0.  , -1.  ,  0.  ],
        [ 1.  ,  0.  ,  0.  , -1.  ]])

>>> null(A).T
array([[-0.5, -0.5, -0.5, -0.5]])

>>> (A*null(A)).T
matrix([[ 1.66533454e-16, -1.66533454e-16, -2.22044605e-16, -2.22044605e-16]])

See also the section Numerical computation of null space on Wikipedia.