Buss/connectus
Website recommendation system, Steven Buss, Univ. Florida
Name 
connectus 
Group 
Buss 
Matrix ID 
2247 
Num Rows

512 
Num Cols

394,792 
Nonzeros

1,127,525 
Pattern Entries

1,127,525 
Kind

Undirected Bipartite Graph 
Symmetric

No 
Date

2009 
Author

S. Buss 
Editor

T. Davis 
Structural Rank 
458 
Structural Rank Full 
false 
Num Dmperm Blocks

8 
Strongly Connect Components

256 
Num Explicit Zeros

0 
Pattern Symmetry

0% 
Numeric Symmetry

0% 
Cholesky Candidate

no 
Positive Definite

no 
Type

binary 
SVD Statistics 
Matrix Norm 
4.833412e+02 
Minimum Singular Value 
0 
Condition Number 
Inf

Rank 
456 
sprank(A)rank(A) 
2 
Null Space Dimension 
56 
Full Numerical Rank? 
no 
Download Singular Values 
MATLAB

Download 
MATLAB
Rutherford Boeing
Matrix Market

Notes 
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).
