Re: [eigen] [PATCH] Toeplitz matrix specialization |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] [PATCH] Toeplitz matrix specialization*From*: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>*Date*: Fri, 30 Jan 2009 08:04:29 +0100*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=WU98YfgVPV8aDIInSNxjE5BwKGgP0xWM9+LJJ7KHbgI=; b=YZQoGxRjeir5lt0SpmG5zhcoaPeNRO8tumYv3BypYBMe3k7tV9CDXB6mcA+b/7esuS pwpoXboB0GM5MYtMrV6hbE79tOC/+uBEtUlWBkARDYZe5cSosjddaWlfVZreMublYVoT wnGZ2Nh6ResxHE5J4b/zyux8Wf088l8GHETEw=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=snLVQ//nEiNgCuT1t968fK5WBilG8nDnEmf3CfyF5R/xXtxVu/dI0qvtNoTDdVClxk fjJjBhD7CVOlxlA0zwgLKaNIkPAUcYflpZPlb3ndtJVzcxhVTyX6p4Oa0dCoHFARW5L5 McALGEOeK/9oysqxInegG0hMTXBWQ6H8BgLvk=

On Fri, Jan 30, 2009 at 12:54 AM, Jitse Niesen <jitse@xxxxxxxxxxxxxxxxx> wrote: > On Thu, 29 Jan 2009, Gael Guennebaud wrote: > >> to start the debate I put some thougths on the wiki: >> http://eigen.tuxfamily.org/index.php?title=SpecialMatrix > > Does "we assume we don't need a special class for triangular storage" mean > that triangular matrices are stored as general matrices (and thus half the > memory is wasted)? That strikes me as an assumption that could be regretted > later. So perhaps we should make sure that a special class for triangular > storage can be added later. in short yes for both. actually, in all our current cases (LU, LLt, QR, Hessenberg, etc.) the triangular/hessenberg matrix are packed with other data so that there is no overhead. So what we primarily need is "view" to triangular part of a dense matrix. In the future, I don't any reason why we could not add a compact triangular storage.

**Follow-Ups**:**RE: [eigen] [PATCH] Toeplitz matrix specialization***From:*Ben Axelrod

**References**:**[eigen] [PATCH] Toeplitz matrix specialization***From:*Ricard Marxer Piñón

**Re: [eigen] [PATCH] Toeplitz matrix specialization***From:*Benoit Jacob

**Re: [eigen] [PATCH] Toeplitz matrix specialization***From:*Mauro Iazzi

**Re: [eigen] [PATCH] Toeplitz matrix specialization***From:*Benoit Jacob

**Re: [eigen] [PATCH] Toeplitz matrix specialization***From:*Gael Guennebaud

**Re: [eigen] [PATCH] Toeplitz matrix specialization***From:*Jitse Niesen

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