Re: [eigen] two decisions to take |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] two decisions to take*From*: Benoît Jacob <jacob@xxxxxxxxxxxxxxx>*Date*: Wed, 5 Sep 2007 08:12:19 +0200

On Tuesday 04 September 2007 21:33:27 Andre Krause wrote: > > It's not a big deal adding member functions. In Eigen1 we allowed both > > dot(v,w) and v.dot(w), so I think we'll do the same in Eigen2, since > > there seems to be strong advocates of both approaches :) > > fine, as long as the global dot or cross functions are present (of > course inside eigen's namespace), i have no objections against member > functions. if it is well documented that those change the value of the > object itself. wait, I didn't mean that! u.cross(v) should return a cross-product expression, not assign it to u ! > too bad c++ cannot overload the dot-operator... but well, if "|" is that > well known in quantum mechanics (to be honest, never seen that use, do > you have some link / pdf showing that?), it sounds fine to overload it > for dot product. Actually it's not just quantum mechanics, it's really common in mainstream mathematics. The dot product of x with y is often denoted by (x|y) or <x|y>, though the most common form is <x,y> (but we don't want to overload operator, here). See this page: http://en.wikipedia.org/wiki/Bra-ket_notation especially the bottom: http://en.wikipedia.org/wiki/Bra-ket_notation#Notation_used_by_mathematicians > > > kind regards, andre! > p.s. i am very excited about the upcoming new eigen! thanks for all your > efforts, benoit ! i like your way of "keep it as simple as possible". so > maybe even c++ noobs like me will have a chance to understand the magic > behind expression templates. or at least get the rough idea. Thanks for the kind words. I didn't know either about ETs before Ben mentioned them, and I would not have understood them if I hadn't spent time playing with TVMET's source code. For Eigen2 I will write documentation about them, because I want to lower the barrier to contribution. Cheers, Benoit

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**References**:**Re: [eigen] two decisions to take***From:*Schleimer, Ben

**Re: [eigen] two decisions to take***From:*Benoît Jacob

**Re: [eigen] two decisions to take***From:*Andre Krause

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