Array in R?

[pell...@gmail.com]

Hi All,

I have this array :

arr <- array(data = c(0.1, 0.52, 0.3, 0.4, 0.3, 0.2, 0.7, 0.8), dim = c(2, 2, 2))
I want to test if there is a value > 0.5 so return it if not return NA.

I tried this but it is not what I want :

apply(arr, c(1,2), function(x) {ifelse(x >0.5, x,NA)})
my desire output 1 matrix 2*2:

res1= #resturn the value
[,1] [,2]
[1,] NA 0.7
[2,] 0.52 0.8
and another matrix 2*2 to show the index res2= return the index of that value

[,1] [,2]
[1,] NA 1
[2,] 1 2
1 means 0.7 comes from the first matrix arr[,,1]

2 means 0.8 comes from the second matrix arr[,,2] etc

Any hints on this.
thanks
Thom

[Philip Radtke]

Hi Thom,

Would this work for you?

arr[arr > 0.5] <- NA

cheers,

-Phil

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