Message-ID: <CAJJHHA-ak2yK3+Vrnkwr8yBSm2iWj07j0T1VK-Fsx6vQ3kLmsA@mail.gmail.com>
Date: 2013-03-31T09:32:08Z
From: stat quant
Subject: [Rcpp-devel] Datetime substraction bug ?
In-Reply-To: <710009864.5916040.1364625440937.JavaMail.root@mines-paristech.fr>
Thanks a lot for reporting this I would surely have been caught (may be I
am I'll go through code I wrote using this) by this bug.
Posting your workaround would not hurt I think...
Thanks and cheers
2013/3/30 Robin Girard <robin.girard at mines-paristech.fr>
> Thanks you're right I already wrote it myself with getFractional...
> and indeed that's not really what we should call a "bug" but it took me a
> while to understand that
>
> if date1-date2>0 then date1<date2 ;)
>
> R.
>
>
> ----- Mail original -----
> De: "Dirk Eddelbuettel" <edd at debian.org>
> ?: "Robin Girard" <robin.girard at mines-paristech.fr>
> Cc: rcpp-devel at lists.r-forge.r-project.org
> Envoy?: Samedi 30 Mars 2013 00:44:08
> Objet: Re: [Rcpp-devel] Datetime substraction bug ?
>
>
> On 29 March 2013 at 23:37, Robin Girard wrote:
> | Hi List
> |
> | why is it that we have in the Datetime definition
> | (here
> http://dirk.eddelbuettel.com/code/rcpp/html/Date_8cpp_source.html#l00271 )
> |
> | double operator-(const Datetime& d1, const Datetime& d2) { return
> d2.m_dt - d1.m_dt; }
> | bool operator<(const Datetime &d1, const Datetime& d2) { return d1.m_dt
> < d2.m_dt; }
> |
> | I feel there is a contradiction
> | substraction shoulb be d1.m_dt - d2.m_dt; no ?
>
> It's been a while since I wrote that and I think I followed the difftime()
> convention in R. Or maybe not. To me d1 comes before d2 in the way the
> arguments are given, so d2 is larger and I want to subtract d1 from d2.
>
> In any event, if it bugs you greatly you are always free to write your own
> function. ;-)
>
> Dirk
>
> |
> | Robin
> |
> | Dr. Girard Robin
> | Charg? de Recherche
> |
> | MINES-ParisTech / D?partement Energ?tique et Proc?d?s / PERSEE / Groupe
> ERSEI
> | Centre Proc?d?s, Energies Renouvelables et Syst?mes Energ?tiques (PERSEE)
> | Center for Processes, Renewables Energies and Energy Systems
> | Renewable Energies & Smartgrids (ERSEI)
> |
> | 1 Rue Claude Daunesse - CS 10207 - F-06904 Sophia Antipolis Cedex
> | Tel: +33.4.93.67.89.64 (~99), Fax: +33.4.93.95.75.35
> | e-mail : robin.girard at mines-paristech.fr
> |
> | web page perso http://www.mines-paristech.fr/Services/Annuaire/&?id=8828
> | statoverflow : http://stats.stackexchange.com/users/223/robin-girard
> | web page centre PERSEE : http://www.cep.mines-paristech.fr/
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> |
> | Le lien vaut mieux que le bien.
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