R help - Jul 2008 - Find classes of each column of data.frame()

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

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
>

Dong-hyun Oh wrote:
> Dear UseRs,
>
> I would like to know the way to find classes of each column of
> data.frame().
>
sapply(<your-data-frame>, class)

vQ