Re: [R] syntax to subset for multiple values from a single variable

From: Ivan Calandra <ivan.calandra_at_uni-hamburg.de>
Date: Wed, 06 Apr 2011 11:38:19 +0200

Hi,

I'm not sure what you're looking for because it looks to me that you have the answer already...
Is this what you want:
subset(df, x %in% c('a','b'))
?

Ivan

Le 4/6/2011 10:45, SNV Krishna a écrit :
> Hi All,
>
> Is it possible to use the subset() function to select data based on multiple
> values of a single variable from a data frame.
>
> My actual data set is much bigger and would like to illustrate with
> following dataset
>> df = data.frame(x = c('a','b','c','d','e','f','g','h','a','a','b','b'), y
> = 1:12)
> I would like to select all rows where x = a or b.
>
>
>> subset(df, x == c('a','b')) # this command did not return all rows where x
> is equal to a or b
>
> x y
>
> 1 a 1
>
> 2 b 2
>
> 9 a 9
>
> 12 b 12
>
>> df[df$x %in% c('a','b'),] # subsetting using subscripts returned all rows
> x y
>
> 1 a 1
>
> 2 b 2
>
> 9 a 9
>
> 10 a 10
>
> 11 b 11
>
> 12 b 12
>
> I know there might be a problem with subset syntax that I have used, but
> could'nt figure out what it is. Any insights from members will be highly
> appreciated and thanks for the same.
>
> Regards,
>
> S.N.V. Krishna
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
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>

-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. Säugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra_at_uni-hamburg.de

**********
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Received on Wed 06 Apr 2011 - 09:42:41 GMT

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