Find out if matrix is positive definite with numpy

Question

I need to find out if matrix is positive definite. My matrix is numpy matrix. I was expecting to find any related method in numpy library, but no success. I appreciate any

Answer 1

For Not symmetric Matrix you can use the Principal Minor Test :

def isPD(Y):
  row = X.shape [0]
  i = 0
  j = 0
  for i in range(row+1) : 
    Step = Y[:i,:j]
    j+=1
    i+=1
    det = np.linalg.det(Step)
    if det > 0 : 
        continue 
    else :
        return ("Not Positive Definite, Test Principal minor failed")

  return ("Positive Definite")