[R] how to compute a vector of min values ?

[peter dalgaard]

On Apr 6, 2012, at 00:25 , ikuzar wrote:

> Hi, 
> 
> I'd like to know how to get a vector of min value from many vectors without
> making a loop. For example :
> 
>> v1 = c( 1, 2, 3)
>> v2 =  c( 2, 3, 4)
>> v3 = c(3, 4, 5)
>> df = data.frame(v1, v2, v3)
>> df
>  v1 v2 v3
> 1  1  2  3
> 2  2  3  4
> 3  3  4  5
>> min_vect = min(df)
>> min_vect
> [1] 1
> 
> I 'd like to get min_vect = (1, 2, 3), where 1 is the min of v1, 2 is the
> min of v2 and 3 is the min of v3.
> 
> The example above are very easy but, in real, I have got v1, v2, ... v1440 

sapply(df, min)

(possibly sapply(df, min, na.rm=TRUE) )

> 
> Thanks for your help, 
> 
> ikuzar
> 
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> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com