I am very confuse,
I send with a wrong subject.
All my Apologizes
-----
________________________________________
De : Guibert TCHINDE
Date d'envoi : jeudi 1 août 2013 18:51
À : r-help@r-project.org
Cc : R help
Objet : RE : [R] Conversion of matrix in r to integer
Dear List,
I am trying to replicate an SQL request run wih SAS using R
The request is :
PROC SQL;
CREATE VIEW myview AS
SELECT a.*,
b.semaine
b.date_debut
b.date_fin
FROM myfirsttable. a
INNER JOIN
mycalendar
ON ( a.DEBUT1 <= b.date_fin AND a.FIN>= b.date_debut
AND (a.MIG = 'O' AND a.DATE_MIG <= b. date_fin)
QUIT;
Like we see, ther's not join key between the two datasets and the job run by
sas is to : make cartesian product and subsetting according to the conditions
So when i try to replicate this in R. I do this :
> system.time(extract<-merge(myfirsttable,mycalendar))
utilisateur système écoulé
6509.51 47.61 6792.12
> system.time(VueAnalyse<-subset(extracts,
+ (DEBUT1<=date_fin & FIN>=date_debut) &
+ ((MIG == 'O' & DATE_MIG <= date_fin))
utilisateur système écoulé
178.59 14.07 211.11
The first datasets contains 40 millions rows and the second just 5.
So the first cartesian product take ~2 hours.
Somebody have any idea to do this in R with less time?
Thanks in advance
Regards,
GT
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