[R] Simple For Loop Help

[jim holtman]

tyr this:

> # generate some data
> x <- cbind(y1 = runif(100)
+          , y2 = runif(100)
+          , y3 = runif(100)
+          )
>
> x <- cbind(x, y4 = apply(x, 1, which.min))
> x
                y1            y2          y3 y4
  [1,] 0.976953289 0.91072645970 0.713624001  3
  [2,] 0.630992512 0.49545109738 0.492651173  3
  [3,] 0.805360855 0.10164273344 0.487412602  2
  [4,] 0.206557258 0.93518137769 0.967720379  1
  [5,] 0.742643551 0.01508265687 0.184230089  2
  [6,] 0.273187587 0.96277903509 0.975695134  1
  [7,] 0.531257896 0.28845930938 0.884927711  2
  [8,] 0.443350543 0.83843108499 0.932529126  1
  [9,] 0.741068321 0.18445303664 0.918877386  2
 [10,] 0.702316870 0.33005132875 0.873039624  2
 [11,] 0.344680035 0.01381954318 0.317793813  2
 [12,] 0.458753836 0.87229841063 0.744396384  1
 [13,] 0.843603048 0.54047069070 0.450843775  3
 [14,] 0.409279518 0.63338707620 0.776766221  1
 [15,] 0.352133089 0.50061018439 0.807262663  1
 [16,] 0.560342140 0.45078424131 0.885666004  2


On Thu, Mar 29, 2012 at 5:32 PM, arun.gurubaramurugeshan
<arun.gurubaramurugeshan at autozone.com> wrote:
> Hi,
> I need help with the following.
>
> I have a dataset Y with 200 observations and three variables Y1, Y2 & Y3. I
> have to find the minimum of Y1, Y2 & Y3 and if the minimum is Y1 then I have
> to assign 1 to a variable (Y4), if Y2 is the minimum then "2" to Y4  else
> "3" to Y4. This is what I have done....
>
> for (i in 1:200) if(Y1<Y2 & Y1<Y3) Y$Y4=1 else if (Y2<Y3) Y$Y4=2
> else Y$Y4=3
>
> and R is throwing back this warning message
>
> Warning messages:
> 1: In if (Y1 < Y2 & Y1 < Y3) Y4 <- 1 else if (Y2 < Y3) Y4
> <- 2 else Y4 <- 3 :
>  the condition has length > 1 and only the first element will be used
> 2: In if (Y2 < Y3) Y4 <- 2 else Y4 <- 3 :
>  the condition has length > 1 and only the first element will be used
>
> Any help would be appreciated.
>
> Thanks
> Arun
>
> --
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>
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.