Public bug reported:
Binary package hint: scilab
I encountered the following bug when running the attached scilab program
test.sci in scilab 4.0:
-->A=[1,0.5;0.5,1];
-->[U,S,V]=svd(A);
-->B=U*S*V'
-->A-B
gives
-->B=U*S*V'
B =
0. 0.5
0.5 0.
-->A-B
ans =
1.0E-15 *
0.2220446 0.3330669
0. 0.1110223
As you can see, the value for B is wrong, since B should equal A.
On the other hand A-B is practically 0.
The problem occured on two different platforms (running ubuntu) using the
debian package.
However, it does not occur in scilab 4.1 as downloaded from www.scilab.org,
i.e. here we get the correct answer for B
-->B=U*S*V'
B =
1. 0.5
0.5 1.
-->A-B
ans =
1.0E-15 *
0.2220446 0.3330669
0. 0.1110223
I have reported this to Torsten Werner, the dedian-package maintainer, who said
that he knew that the scilab package in ubuntu
is completely broken, but that there is no problem of that sort on a debian
platform.
** Affects: scilab (Ubuntu)
Importance: Undecided
Status: Unconfirmed
--
scilab gives wrong results
https://bugs.launchpad.net/bugs/106757
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