Dear UseRs, I would like to know the way to find classes of each column of data.frame(). Thank you in advance. ========================================================Dong-hyun Oh Center of Excellence for Science and Innovation Studies Royal Institute or Technology, Sweden e-mail: oh.dongh at gmail.com cel: +46 73 563 45 22
Henrique Dallazuanna
2008-Jul-01 14:00 UTC
[R] Find classes of each column of data.frame()
sapply(your_data, class) On Tue, Jul 1, 2008 at 10:50 AM, Dong-hyun Oh <r.arecibo@gmail.com> wrote:> Dear UseRs, > > I would like to know the way to find classes of each column of > data.frame(). > > Thank you in advance. > > > > > ========================================================> Dong-hyun Oh > Center of Excellence for Science and Innovation Studies > Royal Institute or Technology, Sweden > e-mail: oh.dongh@gmail.com > cel: +46 73 563 45 22 > > ______________________________________________ > R-help@r-project.org 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. >-- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
A data frame is a special list:> d <- data.frame( A=numeric(), B=logical(), C=character() ) > lapply(d, class)$A [1] "numeric" $B [1] "logical" $C [1] "factor" Gabor On Tue, Jul 01, 2008 at 03:50:18PM +0200, Dong-hyun Oh wrote:> Dear UseRs, > > I would like to know the way to find classes of each column of > data.frame(). > > Thank you in advance. > > > > > ========================================================> Dong-hyun Oh > Center of Excellence for Science and Innovation Studies > Royal Institute or Technology, Sweden > e-mail: oh.dongh at gmail.com > cel: +46 73 563 45 22 > > ______________________________________________ > R-help at r-project.org 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.-- Csardi Gabor <csardi at rmki.kfki.hu> UNIL DGM
Many thanks. On Jul 1, 2008, at 3:57 PM, Romain Francois wrote:> sapply( iris, class ) > > Dong-hyun Oh wrote: >> Dear UseRs, >> >> I would like to know the way to find classes of each column of >> data.frame(). >> >> Thank you in advance. >> >> >> >> >> ========================================================>> Dong-hyun Oh >> Center of Excellence for Science and Innovation Studies >> Royal Institute or Technology, Sweden >> e-mail: oh.dongh at gmail.com >> cel: +46 73 563 45 22 > > -- > Mango Solutions > data analysis that delivers > > Tel: +44(0) 1249 76 77 00 > Fax: +44(0) 1249 76 77 07 > Mob: +44(0) 7813 52 61 23 >