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and also, since det(V) = 0, can I use qp_solve, or should i use the
quapro toolbox?<br>
<br>
On 06/09/2011 00:10, Adrien Vogt-Schilb wrote:
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Hi everybody<br>
<br>
I have a 20k x 20k inferior triangular matrix, that I use in a
QPsolve<br>
<br>
V = -2* TIS(n,n) + (n-1) * eye(n;n)<br>
<br>
This is V= [ (n-1) 0.....................0<br>
2 (n-1) 0..............0<br>
2 2 (n-1) 0......0<br>
....<br>
]<br>
-Is there any way to get a TI matrix from scilab, without using
loops?<br>
<br>
I would like to use V as a "cost function" for qpsolve (minimize
X'.V.X)<br>
-Is qpsolve smart enough to change the basis, or should i do it
myself?<br>
<br>
-Should I use sparse matrices? Can I make a sparse trinagular
matrix quickly?<br>
<br>
Some student have implemented faster code for sparse matrices in
2004 (<a moz-do-not-send="true" class="moz-txt-link-freetext"
href="http://www.iecn.u-nancy.fr/%7Epincon/scilab/expose_taiwan.pdf">http://www.iecn.u-nancy.fr/~pincon/scilab/expose_taiwan.pdf</a>).
<br>
-Is this implemented in Scilab?<br>
<br>
<br>
<div class="moz-signature">-- <br>
<p style="color:teal; font-size:12pt;"><b>Adrien Vogt-Schilb</b><br>
Research Fellow<br>
<a moz-do-not-send="true" class="moz-txt-link-abbreviated"
href="mailto:vogt@centre-cired.fr">vogt@centre-cired.fr</a><br>
Tel: (+33) 1 43 94 73 96<br>
Fax: (+33) 1 43 94 73 70<br>
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<br>
<div class="moz-signature">-- <br>
<p style="color:teal; font-size:12pt;"><b>Adrien Vogt-Schilb</b><br>
Research Fellow<br>
<a class="moz-txt-link-abbreviated" href="mailto:vogt@centre-cired.fr">vogt@centre-cired.fr</a><br>
Tel: (+33) 1 43 94 73 96<br>
Fax: (+33) 1 43 94 73 70<br>
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<p style="font-size:10pt; color:teal">45 bis, Av de la
Belle Gabrielle<br>
F-94736 Nogent-sur-Marne<br>
<a href="http://www.centre-cired.fr/" style="color:teal">http://www.centre-cired.fr/</a><br>
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