First hitting time python

from numpy import *

hit_idx = (0,4)

# Define a graph by edge list
edges = [[0,1],[1,2],[2,3],[2,4]]

# Create adj. matrix
A = zeros((5,5))
A[zip(*edges)] = 1
# Undirected condition
A += A.T

# Make the final state an absorbing condition
A[hit_idx[1],:] = 0
A[hit_idx[1],hit_idx[1]] = 1

# Make a proper Markov matrix by row normalizing
A = (A.T/A.sum(axis=1)).T

B = A.copy()
Z = []
for n in xrange(100):
    Z.append( B[hit_idx] )
    B = dot(B,A)

from pylab import *
plot(Z)
xlabel("steps")
ylabel("hit probability")
show()

Source: stackoverflow.com

Similar codes

0 vote170 views1 answer
How to count to 1billion in python
Python
0 vote186 views1 answer
Paystack python
Python
4 votes202 views1 answer
Edit line if str end with pandas
Python
0 vote177 views1 answer
Python PowerPoint
Python
0 vote170 views3 answers
How to catch ctrl c in python
Python
0 vote232 views2 answers
How to create template folder in django
Python Django
1 vote225 views1 answer
How to delete a specific line in a file
Python
3 votes200 views1 answer
Default argument in flask route
Python Flask
1 vote218 views1 answer
R vs python
Python
3 votes174 views3 answers
Python json check if key exists
Python