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[Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth par
From: |
Eduardo Ramos Fernández |
Subject: |
[Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth parameter missing in Octave |
Date: |
Tue, 11 Mar 2014 21:19:10 +0000 |
User-agent: |
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:26.0) Gecko/20100101 Firefox/26.0 |
URL:
<http://savannah.gnu.org/bugs/?41839>
Summary: sprand/sprandn functions with 4rth parameter
missing in Octave
Project: GNU Octave
Submitted by: edu159
Submitted on: mar 11 mar 2014 21:19:09 GMT
Category: Octave Function
Severity: 3 - Normal
Priority: 5 - Normal
Item Group: Matlab Compatibility
Status: None
Assigned to: None
Originator Name: Eduardo Ramos (edu159)
Originator Email:
Open/Closed: Open
Discussion Lock: Any
Release: dev
Operating System: GNU/Linux
_______________________________________________________
Details:
I have modified sprand/sprandn functions to include a fourth parameter (rc,
reciprocal condition number) compliant with Matlab. The approach I followed
was:
>From the singular value descomposition A =U*S*V'.
1) If rc is a scalar then it would be the reciprocal condition number and I
will set the minimum singular value and maximun singular value to fit to it.
Then random values between vmin and vmax will be generated and sorted. With
that S is build.
2)If rc is a vector, the values inside are the first singular values of the
matrix. The rest will be 0. S is build from them as diagonal elements.
3)Once we have S we can see U and V as rotation matrices(they are ortogonal
and , so they will be Jacobi rotation matrices formed by n rotations U =
U1*U2*...Un , V=V1*V2...*Vn
In each iteration the matrix will be populated until density required is
achieved (from testing with a 0.01% of error).
Feedback would be welcome.
_______________________________________________________
File Attachments:
-------------------------------------------------------
Date: mar 11 mar 2014 21:19:09 GMT Name: sprand_4rth_parameter.diff Size:
10kB By: edu159
<http://savannah.gnu.org/bugs/download.php?file_id=30862>
_______________________________________________________
Reply to this item at:
<http://savannah.gnu.org/bugs/?41839>
_______________________________________________
Mensaje enviado vía/por Savannah
http://savannah.gnu.org/
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth parameter missing in Octave,
Eduardo Ramos Fernández <=
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth parameter missing in Octave, Eduardo Ramos Fernández, 2014/03/12
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth parameter missing in Octave, Kai Torben Ohlhus, 2014/03/20
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions with 4rth parameter missing in Octave, Eduardo Ramos Fernández, 2014/03/21
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Rik, 2014/03/22
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Eduardo Ramos Fernández, 2014/03/22
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Eduardo Ramos Fernández, 2014/03/22
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Rik, 2014/03/23
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Eduardo Ramos Fernández, 2014/03/24
- [Octave-bug-tracker] [bug #41839] sprand/sprandn functions missing 4th input parameter, Rik, 2014/03/24