Re: [eigen] new tutorial on writing functions taking Eigen types as paramters |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] new tutorial on writing functions taking Eigen types as paramters*From*: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>*Date*: Wed, 4 Aug 2010 10:26:59 -0400*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=y+zDvWOo8Llu+Gl3SIXEhSYXPpH+ts8wqDI46lIMwcU=; b=Syw+Sm6lUHIFuPEHF3B7QR/jEBVs1qdJ1CQu1eOs/v+OgDhSPJ3rlXDZBqvLUVnjhQ cu0JUSpHVcKru1Biw1tR+CJ/uyG+uD+3PJWtdmhxwwawAm12ZVkahmrRGuO3H1Ji28cw Bn3clGYoK+37JhCirqTxgN8CIXGg8sxe/kK4A=*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=t0JP5pC7EExpSebyf//rrARpWRov2iJYMEJBjKf7i6MjQjg/SFHJvV8cevUPBSJCzI Xe8KCD2e4VyezfkGYe9f75f7sOiasvAw0+ByFuTcxVvRMCCb2VgH8v7Ae8XQkVKy++XE DRQfyRDaGh/x1UjnLZzdr43GCJ5chcpKSLbBU=

2010/8/4 Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>: > I already pushed it this morning though the docs are not yet rebuild. Ah ok, i see it now. Bitbucket's email notification is just not working. > > I focused on one specific example and investigated different types of > implementations discussing each implementation's problems and > benefits. > > Currently, the page only covers MatrixBase (and ArrayBase since the > same discussion holds for both classes). So nothing about DenseBase -- > regarding the class hierarchy, there is already some information > there, right? Or what exactly do you mean? So, a few remarks/comments. 1. I would like this page to start with a very simple example e.g. template<typename T> void print_size(const DenseBase<T>& m) { std::cout << "size: " << m.rows() << "x" << m.cols() << std::endl; } 2. I would like arrays and matrices to be treated a bit more on an equal footing (instead of focusing 90% on MatrixBase) and I would like DenseBase to be explained, and EigenBase to be briefly mentioned. Tell the user that: - MatrixBase is for all dense matrix expressions - ArrayBase is for all dense array expressions - DenseBase is for all dense expressions - EigenBase is for all Eigen objects, including pseudo-expressions such as DiagonalMatrix. I think this page should at least contain 1 example for each of these base classes. 3. You can strip a bit the language e.g. in "Eigen is making heavy use of expression templates and as a consequence almost all operations on Matrices and Arrays result in individual objects." <---- every C++ function returns an "individual object" (if not void) so this sentence doesn't seem to contain much information. I think that what you really mean here is that every different expression has a different type, e.g. a+b has a different type than a+b+c. Benoit (has to go back to work :) ) > > - Hauke > > On Wed, Aug 4, 2010 at 4:05 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote: >> Great idea, looking forward to it. The way I see it: >> >> - we need a special topic page on the main base classes (DenseBase, >> ...) which could give examples of functions taking Eigen objects. >> - we need a very abridged/simplified version of that on the last page >> of the tutorial, which should be where users learn what they really >> need to know in order to be a little autonomous reading the docs >> (which requires them to know a little about the base classes). >> >> The question of how to write a function taking eigen objects as >> arguments is one we've answered easily 10 times on the forum. Having >> something to link to would be very valuable. > > >

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**References**:**[eigen] new tutorial on writing functions taking Eigen types as paramters***From:*Hauke Heibel

**Re: [eigen] new tutorial on writing functions taking Eigen types as paramters***From:*Benoit Jacob

**Re: [eigen] new tutorial on writing functions taking Eigen types as paramters***From:*Hauke Heibel

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