[R] Finding the Min.

[stat stat]

Dear all R users,
   
  Suppose I have a dataset like that, data = 
   
  1 1.957759e-09
2 1.963619e-09
3 1.962807e-09
4 1.973951e-09
5 1.983401e-09
6 1.990894e-09
7 2.000935e-09
8 1.998391e-09
9 1.973322e-09
   10 1.983202e-09
   
  I want to see at which row minimum value of the second column occures.
   
  Therefore I made the following loop:
   
  i=1
  while (min(data[,2]) != data[i,2]) 
 {
  i = i+1
 }
  
   i
[1] 1

  Is there any more effective way to do that in terms of time consumption?
   
  Thanks
  stat


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Re: [R] Finding the Min.

[Pfaff, Bernhard Dr.]

?which.min


Dear all R users,
   
  Suppose I have a dataset like that, data = 
   
  1 1.957759e-09
2 1.963619e-09
3 1.962807e-09
4 1.973951e-09
5 1.983401e-09
6 1.990894e-09
7 2.000935e-09
8 1.998391e-09
9 1.973322e-09
   10 1.983202e-09
   
  I want to see at which row minimum value of the second 
column occures.
   
  Therefore I made the following loop:
   
  i=1
  while (min(data[,2]) != data[i,2]) 
 {
  i = i+1
 }
  
   i
[1] 1

  Is there any more effective way to do that in terms of time 
consumption?
   
  Thanks
  stat

   
-
 Here's a new way to find what you're looking for - Yahoo! Answers 
   [[alternative HTML version deleted]]


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Re: [R] Finding the Min.

[Jarimatti Valkonen]

stat stat wrote:

   I want to see at which row minimum value of the second column occures.

   Therefore I made the following loop:

[snip while-loop]

 
   Is there any more effective way to do that in terms of time consumption?

I don't know about timing, but I understand that loops are somewhat 
slow. Assuming that x is the first column and y is the second column:

D - data.frame( x = 1:10, y = rnorm(10) )
D$x[ which.min(D$y) ]

See the help of which.min for more info.

-Jarimatti

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