Re: [eigen] Specialized QR |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] Specialized QR*From*: Andrea Arteaga <yo.eres@xxxxxxxxx>*Date*: Wed, 20 May 2009 12:17:33 +0200*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:from:to:subject:date :user-agent:references:in-reply-to:mime-version:content-type :content-transfer-encoding:content-disposition:message-id; bh=eO/RUo2sqBZ+TNP9RqWoux32lTq+EGPuJVRWXP3v58w=; b=NPBDZamuoESkfDyx8DVNhQ+IhPfYl1BomeVgzvkZu8jWzddHAQuHGzK28QplQQPSgO 1vCaVwhMkTjvdQIKnEj8tOMMkq4a8rhXs0QTchblZxB42zXwVqyCxqbP37h+2s2hcZim E6U8E1ps0+6jlkaafwxa8NFzXgTGj0LLi0t/Y=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:user-agent:references:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :message-id; b=bYnYBOu0GP0u6mZXYVaNMsD1K4dDvn0fSA3jpgBfGiyG9mSYo2iYvVWK8Hqz6JcGqn JK/+y0IjMf4zOaA7vlnFSR/R8FHiV90Qt9KzfR+1EqviouYxHJLbAhXChBOdg68t6Otz bhpSjZfGRtPHAgElrigv8D4Qj2n3PlW0EnAIA=

> But you can compute Q^T b by applying the Givens rotations directly to the > vector b, for a cost of only O(n^2). |

**Follow-Ups**:**Re: [eigen] Specialized QR***From:*Benoit Jacob

**References**:**Re: [eigen] Specialized QR***From:*Andrea Arteaga

**Re: [eigen] Specialized QR***From:*Benoit Jacob

**Re: [eigen] Specialized QR***From:*Jitse Niesen

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