Using nearest functiont?

I have this huge matrix 500 by 500 I want to use nearest to find the 25 values that are nearest to X node

I did this but I'm not sure if it is correct when I displayed n I got more than 10 values

G= graph(A);
X= 238;
n = nearest(G,X,25);

[Walter Roberson]

As outside observers, we have no reason to expect that there would be 10 or fewer nodes within distance 25 of node 238.