Description: Website recommendation system, Steven Buss, Univ. Florida
|(bipartite graph drawing)|
|number of rows||512|
|number of columns||394,792|
|structural full rank?||no|
|# of blocks from dmperm||8|
|# strongly connected comp.||256|
|explicit zero entries||0|
|nonzero pattern symmetry||0%|
|numeric value symmetry||0%|
|kind||undirected bipartite graph|
This is a matrix from Steven Buss, for a website recommendation system (to be called www.connectious.com). Each row of the matrix is a unique user. Eachc olumn of the matrix is a web page. A(i,j)=1 if user i has tagged web page j as favorable, and a 0 represents no opinion. The data was obtained from digg.com. Note that the matrix A*A' contains one connected component of size 342, and 170 singletons (nodes with no edges) This means that a group of 341 users share some interests, at least indirectly, and that there are 171 other users that share no interests at all with any other users (they have no pages in common with anyone).
|null space dimension||56|
|full numerical rank?||no|
|singular value gap||1.03249e+10|
|singular values (MAT file):||click here|
|SVD method used:||s = svd (full (R)) ; where [~,R,E] = spqr (A') with droptol of zero|
For a description of the statistics displayed above, click here.
Maintained by Tim Davis, last updated 12-Mar-2014.
Matrix pictures by cspy, a MATLAB function in the CSparse package.
Matrix graphs by Yifan Hu, AT&T Labs Visualization Group.