R help - Apr 2010 - Please help with min()

Hello,

I have two vectors of length = 10

x<-c(2,14,79,27,3,126,15,1,12,4)
y<-rep(4,10)

and I would like to create a third vector of length = 10 that contains the
smallest value at each position in the two above vectors.

I have tried:

z<-min(x,y)

but that doesn't work.

With the example data above, the third vector would look like this.
> z
 [1]   2  4  4  4   3 4  4   1  4   4

Any help with this would be much appreciated, thanks!

mark

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Hey Mark,

I am sure there are other ways but one way would be:

data <- cbind(x,y) #put the two vectors in a matrix
> apply(data, 1, min) # use apply() to apply min() to each row
 [1] 2 4 4 4 3 4 4 1 4 4


Best regards,

Josh
On Sat, Apr 17, 2010 at 4:14 PM, Mark Na <mtb954@gmail.com> wrote:
> Hello,
>
> I have two vectors of length = 10
>
> x<-c(2,14,79,27,3,126,15,1,12,4)
> y<-rep(4,10)
>
> and I would like to create a third vector of length = 10 that contains the
> smallest value at each position in the two above vectors.
>
> I have tried:
>
> z<-min(x,y)
>
> but that doesn't work.
>
> With the example data above, the third vector would look like this.
>
> > z
>  [1]   2  4  4  4   3 4  4   1  4   4
>
> Any help with this would be much appreciated, thanks!
>
> mark
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> 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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Joshua Wiley
Senior in Psychology
University of California, Riverside
http://www.joshuawiley.com/

	[[alternative HTML version deleted]]

On 17-Apr-10 23:14:32, Mark Na wrote:
> Hello,
> I have two vectors of length = 10
> 
> x<-c(2,14,79,27,3,126,15,1,12,4)
> y<-rep(4,10)
> 
> and I would like to create a third vector of length = 10 that
> contains the smallest value at each position in the two above vectors.
> 
> I have tried:
> 
> z<-min(x,y)
> 
> but that doesn't work.
> 
> With the example data above, the third vector would look like this.
> 
>> z
>  [1]   2  4  4  4   3 4  4   1  4   4
> 
> Any help with this would be much appreciated, thanks!
> 
> mark
What you need is pmin()
>From ?min :
   'max' and 'min' return the maximum or minimum of _all_ the
    values present in their arguments

Note "all": in other words, your min(x,y) is equivalent to

  min(c(2,14,79,27,3,126,15,1,12,4,4,4,4,4,4,4,4,4,4,4))

(which = 1).

Further from ?min :

  'pmax' and 'pmin take one or more vectors (or matrices)
  as arguments and return a single vector giving the
  'parallel' maxima (or minima) of the vectors. The first
  element of the result is the maximum (minimum) of the
  first elements of all the arguments, the second element of
  the result is the maximum (minimum) of the second elements
  of all the arguments and so on.

Hence pmin() ("p" for "parallel").

Ted.




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Date: 18-Apr-10                                       Time: 00:28:16
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