R help - Apr 2012 - how to compute a vector of min values ?

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 

Thanks for your help, 

ikuzar

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Hello,

Try

apply(df, 2, min)

(By the way, 'df' is the name of a R function, avoid it, 'DF' is
better.)
Hope this helps,

Rui Barradas


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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
> 
> --
> View this message in context:
http://r.789695.n4.nabble.com/how-to-compute-a-vector-of-min-values-tp4536224p4536224.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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-- 
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