U and V have last column all zeros #5
Description
What steps will reproduce the problem?
1.
>cat densa.txt
1.5 0.0 2.5 2.5
0.0 2.5 2.5 0.0
1.5 0.0 2.5 1.0
0.0 2.5 2.5 0.0
0.0 2.5 2.5 0.0
2.
redsvd -i densa.txt -o densa -f dense -r 10
3.
>cat densa.U
-0.401793 +0.706597 -0.582481 +0.000000
-0.486488 -0.308495 -0.038651 +0.000000
-0.358540 +0.463912 +0.810083 +0.000000
-0.486488 -0.308495 -0.038651 +0.000000
-0.486488 -0.308495 -0.038651 +0.000000
>cat densa.V
-0.165886 +0.472878 +0.409235 +0.000000
-0.530701 -0.623149 -0.347478 +0.000000
-0.807177 +0.164981 +0.334580 +0.000000
-0.198253 +0.600711 -0.774494 +0.000000
What is the expected output? What do you see instead?
First, I expected U to be 5 by 5.
Tried same matrix in gnu octave, and the first 3 column match exactly, but the
last one have values not zero:
octave-3.2.4:1> A=[1.5 0 2.5 2.5;0 2.5 2.5 0; 1.5 0 2.5 1.0; 0 2.5 2.5 0;0 2.5
2.5 0]
A =
1.50000 0.00000 2.50000 2.50000
0.00000 2.50000 2.50000 0.00000
1.50000 0.00000 2.50000 1.00000
0.00000 2.50000 2.50000 0.00000
0.00000 2.50000 2.50000 0.00000
octave-3.2.4:2> [u,s,v]=svd(A);
octave-3.2.4:3> u
u =
-4.0179e-01 7.0660e-01 5.8248e-01 1.9052e-16 -3.8365e-20
-4.8649e-01 -3.0849e-01 3.8651e-02 8.1650e-01 -1.2869e-16
-3.5854e-01 4.6391e-01 -8.1008e-01 -3.1762e-17 3.8365e-20
-4.8649e-01 -3.0849e-01 3.8651e-02 -4.0825e-01 -7.0711e-01
-4.8649e-01 -3.0849e-01 3.8651e-02 -4.0825e-01 7.0711e-01
octave-3.2.4:4> v
v =
-1.6589e-01 4.7288e-01 -4.0924e-01 7.6249e-01
-5.3070e-01 -6.2315e-01 3.4748e-01 4.5750e-01
-8.0718e-01 1.6498e-01 -3.3458e-01 -4.5750e-01
-1.9825e-01 6.0071e-01 7.7449e-01 1.1102e-16
What version of the product are you using? On what operating system?
Ubuntu 12.04
redsvd 0.2.0
Please provide any additional information below.
I don't sure it is an issue, I didn't find any other information to let me know
if this behavior is expected.
Original issue reported on code.google.com by hecha...@gmail.com on 27 Sep 2012 at 4:27