The corresponding Matlab script is

load harvard500.mat

G = full(G);

N = size(G,1);

p = 0.85; dd = (1 - p)/N;

c = sum(G,1)';

z = ((1- p)*(c~=0) + (c==0))/N;

Please help me to construct D matrix. Thanks a lot.

Start your script by calling the script setup-page-rank.m to read the variables U, G, 2, p and N that are used throughout the assignment. The cell vector U contains a list of 500 web URLs from the Harvard website. We will rank these URLs based on their importance. p is a fixed number and N is the length of the vector 2. The matrix G is the connectivity matriz of the URLs. Gij 1 if there is a hyperlink to page i from page j and Gij 0 otherwise. The matrix G can be very large but it has very few nonzero entries. The number of nonzero entries in G is the total number of hyperlinks between our URLs. Now define the vector c using In other words ci is the total number of hyperlinks coming into page i. Next, define D as the diagonal matrix with entries 1 /c if i j and ci 0 otherwise