Re: [Boost-users] [multiprecision] radix-2

Subject: Re: [Boost-users] [multiprecision] radix-2
From: Lucas Sousa de Oliveira (luk51000_at_[hidden])
Date: 2013-04-11 21:45:04

Hey Paul,

First of all, thanks for the tips, it did help a lot. But would you mind if
I use you a little more to get up to speed with this project?

Answering your first question, yes, I'm studying to the best of my
capacities and time-constrains. I found the PDF a little too succint
though. If you had some more recommended literature, I'd be very happy to
read it.
I took a brief look at the present library's code but I must confess I got
a little confused. Probably because I was too unprepared. I'll do that
again when I experiment a little more with the examples and know exactly
what to look for.

I did a couple of quick tests to see if my setup is working fine (it is). I
tested it using some Boost.Math functions as suggested, but I reckon the
test was not solid enough yet.
I'll search for a few known big numbers and way to compute them tomorrow.

I think it's more convenient (not to overuse the list) to put my files here
(https://bitbucket.org/luk51000/multiprecision). It's currently empty since
I my git broke today and I didn't have time to fix it, but I should be
pushing code as soon as tomorrow.

--
Lucas Oliveira
On Wed, Apr 10, 2013 at 2:01 PM, <boost-users-request_at_[hidden]>wrote:
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> Today's Topics:
>
>    1. Re: Asio Serial ports: enumerating all the devices
>       (Kerry, Richard)
>    2. Re: [BGL] Error using breadth_first_search with labeled_graph
>       (Jeremiah Willcock)
>    3. Re: [multiprecision] radix-2 (Paul A. Bristow)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Wed, 10 Apr 2013 13:22:14 +0000
> From: "Kerry, Richard" <richard.kerry_at_[hidden]>
> To: "boost-users_at_[hidden]" <boost-users_at_[hidden]>
> Subject: Re: [Boost-users] Asio Serial ports: enumerating all the
>         devices
> Message-ID:
>         <
> 61C67DC73308BD49B2D4B65072480DBA15397181_at_DEFTHW99EZ1MSX.ww931.my-it-solution
> >
>
> Content-Type: text/plain; charset="us-ascii"
>
>
> "vendor id, product id "
> What's that ?
> I mean for a serial device.  If they are present in the device protocol
> then fine, but that depends on the individual devices and their protocols.
> You can check whether there has been any traffic, which might be useful,
> but serial connections are just streams of bytes.
>
>
> Unhelpfully,
> Richard.
>
>
> PS
> I do recognize "vendor id, product id " for SNMP and for other protocols
> working at a higher level than "serial".
>
>
>
>
>
> ________________________________
> From: Boost-users [mailto:boost-users-bounces_at_[hidden]] On Behalf
> Of Vincent Boucher
> Sent: 10 April 2013 13:40
> To: boost-users_at_[hidden]
> Subject: [Boost-users] Asio Serial ports: enumerating all the devices
>
> Hello,
>
> Are there cross-platform methods to discover all the devices currently
> connected through serial ports with Boost?
>
> The idea is to have a function returning a list of device objects, each
> containing a handle, the related vendor id, product id and the baud rate at
> which the device was able to communicate.
>
> My knowledge of serial communication is very limited, may be it is
> technically infeasible. Do you have any thoughts for Boost or other libs?
>
>
> Analog enumerate method for HID devices:
> http://www.signal11.us/oss/hidapi/
>
> Thanks,
>
> Vincent
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> ------------------------------
>
> Message: 2
> Date: Wed, 10 Apr 2013 11:28:43 -0400 (EDT)
> From: Jeremiah Willcock <jewillco_at_[hidden]>
> To: boost-users_at_[hidden]
> Subject: Re: [Boost-users] [BGL] Error using breadth_first_search with
>         labeled_graph
> Message-ID: <alpine.LRH.2.03.1304101127040.48027_at_[hidden]>
> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"
>
> On Tue, 9 Apr 2013, Julio Cezar Novais Raffaine wrote:
>
> > Hi,
> > I'm having the above (end of email) error message when compiling my
> source using breadth_first_search in a
> > labeled_graph, here are some of my definitions:
> >
> > I'm using boost 1.51.0.
> >
> > struct VertexProperty
> > {
> > ? string x;
> > };
> >
> > typedef boost::property<boost::edge_weight_t, double> IndexProperty;
> > typedef boost::labeled_graph<?
> > boost::adjacency_list<boost::vecS, boost::setS, boost::bidirectionalS,
> VertexProperty, IndexProperty>,
> > std::string> GraphT;
>
> I think the issue is that your vertex container is setS.  Many Boost.Graph
> algorithms, including BFS, require a vertex_index property in your graph
> by default, and the error message is saying that your graph does not have
> one.  If you hare not modifying your graph frequently, you might want to
> change the setS to vecS in the definition of GraphT and see if that
> changes anything.
>
> -- Jeremiah Willcock
>
> ------------------------------
>
> Message: 3
> Date: Wed, 10 Apr 2013 18:01:03 +0100
> From: "Paul A. Bristow" <pbristow_at_[hidden]>
> To: <boost-users_at_[hidden]>
> Subject: Re: [Boost-users] [multiprecision] radix-2
> Message-ID: <002e01ce360c$fc000410$f4000c30$@hetp.u-net.com>
> Content-Type: text/plain; charset="us-ascii"
>
>
>
> From: Boost-users [mailto:boost-users-bounces_at_[hidden]] On Behalf
> Of Lucas Sousa de Oliveira
> Sent: Wednesday, April 10, 2013 1:04 PM
> To: boost-users_at_[hidden]
> Subject: [Boost-users] [multiprecision] radix-2
>
> Hey Lucas
>
> I'm considering participating in this year's GSoC 2013 with Boost. I think
> the multiprecision
> problem is very interesting and I'll give my best to implement it
>
> But first, what would you think is the challenge here? What would make
> this problem very complex?
> I'm studying the general radix algorithm and it doesn't seem to be that
> bad. Am I being misled?
>
> I hope you are studying
>
> https://svn.boost.org/trac/boost/wiki/SoC2013#Boost.Multiprecision
>
>
> http://www.boost.org/doc/libs/1_53_0/libs/multiprecision/doc/html/index.html
>
> and especially
>
> http://www.loria.fr/~zimmerma/mca/mca-cup-0.5.1.pdf
>
> If you study the existing decimal (radix = 10) implementation, you will
> see that multiprecision
> makes it rather complicated, even if the underlying algorithms are not.
>
> It must be specific for radix = 2 to be fast.
>
> Ask again if you are still interested after studying these documents, and
> some of the code.
>
> It would be useful to see if you can build some of the examples using
> Boost.Multiprecision decimal,
> perhaps using a Boost.Math function or two.  You could send us a zip of
> your files and output.
>
> Extra marks for providing a Boost.Test comparing with a handful of
> published values. You can use any
> platform, Linux, Mac or Microsoft with your IDE of choice, perhaps Visual
> Studio or NetBeans?
>
> HTH
>
> Paul
>
>
> ---
> Paul A. Bristow,
> Prizet Farmhouse, Kendal LA8 8AB  UK
> [phone]  07714330204
> pbristow_at_[hidden]
>
>
>
>
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