Augusto
cnd <- D1$dates %in% D2$dates
D1[!cnd,]
should do it.
Med venlig hilsen / Regards
Frede Aakmann Tøgersen
Forsker / Scientist
AARHUS UNIVERSITET / UNIVERSITY OF AARHUS
Det Jordbrugsvidenskabelige Fakultet / Faculty of Agricultural Sciences
Forskningscenter Foulum / Research Centre Foulum
Genetik og Bioteknologi / Dept. of Genetics and Biotechnology
Blichers Allé 20, P.O. BOX 50
DK-8830 Tjele
Tel: +45 8999 1900
Direct: +45 8999 1878
Mobile: +45
E-mail: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
Web: www.agrsci.dk
<https://djfpost.agrsci.dk/exchweb/bin/redir.asp?URL=http://www.agrsci.dk/>
________________________________
Tilmeld dig DJF's nyhedsbrev / Subscribe Faculty of Agricultural Sciences
Newsletter
<https://djfpost.agrsci.dk/exchweb/bin/redir.asp?URL=http://www.agrsci.dk/user/register?lan=dan-DK>
.
Denne email kan indeholde fortrolig information. Enhver brug eller
offentliggørelse af denne email uden skriftlig tilladelse fra DJF er ikke
tilladt. Hvis De ikke er den tiltænkte adressat, bedes De venligst straks
underrette DJF samt slette emailen.
This email may contain information that is confidential. Any use or publication
of this email without written permission from Faculty of Agricultural Sciences
is not allowed. If you are not the intended recipient, please notify Faculty of
Agricultural Sciences immediately and delete this email.
________________________________
Fra: [EMAIL PROTECTED] på vegne af [EMAIL PROTECTED]
Sendt: fr 23-02-2007 07:26
Til: R-help@stat.math.ethz.ch
Emne: [R] Extracting a subset from a dataframe
Good day everyone,
Can anyone suggest an effective method to solve
the following problem:
I have 2 dataframes D1 and D2 as follows:
D1:
dates ws wc pwc
2005-10-19:12:00 10.8 80 81
2005-10-20:12:00 12.3 5 15
2005-10-21:15:00 12.3 3 15
2005-10-22:15:00 11.3 13 95
2005-10-23:12:00 12.3 13 2
2005-10-24:15:00 10.3 2 95
2005-10-25:15:00 10.3 2 2
D2:
dates ws wc pwc
2005-02-02:15:00 17.5 5 96
2005-02-19:15:00 20.1 15 97
2005-02-20:18:00 16.5 95 95
2005-03-03:18:00 10.3 95 95
2005-03-04:00:00 13.4 13 95
2005-10-22:15:00 11.3 13 95
2005-10-25:15:00 10.3 2 2
I want to create another dataframe made up
of the values of dataframe1 which are not common
with dataframe2, ie. newD = D1 - (D1 intersection D2)
that is,
newD:
dates ws wc pwc
2005-10-19:12:00 10.8 80 81
2005-10-20:12:00 12.3 5 15
2005-10-21:15:00 12.3 3 15
2005-10-23:12:00 12.3 13 2
2005-10-24:15:00 10.3 2 95
Thanks for any help you can provide,
Augusto
--------------------------------------------
Augusto Sanabria. MSc, PhD.
Mathematical Modeller
Risk Research Group
Geospatial & Earth Monitoring Division
Geoscience Australia (www.ga.gov.au)
Cnr. Jerrabomberra Av. & Hindmarsh Dr.
Symonston ACT 2601
Ph. (02) 6249-9155
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
