I am trying to do something that I am sure should be quite simple: I am trying to make a function which turns a list of number pairs (pairedList) and a vector (botList) into a series of vectors (one for each pair) of length(botlist) where the numbers in those vectors are all equal to zero except for those corresponding to the index points identified by the pair which will be 1.

```
#generating mock data to simulate my application:
pair1 <- c(2,4)
pair2 <- c(1,3)
pair3 <- c(5,6)
pairedList <- c(pair1, pair2, pair3)
botList <- c(1:length(pairedList))
```

Here is what the output should ultimately look like:

```
[1] 0 1 0 1 0 0
[1] 1 0 1 0 0 0
[1] 0 0 0 0 1 1
```

The code below allows me to print the vectors in the right manner (by replacing the line in the if loop with print(prob) and commenting out the final print statement):

```
library(gtools)
test <- function() {
#initialising empty list
output <- list()
for (i in botList) {
x <- rep(0, length(pairedList))
ind <- pairedList[i:(i+1)]
ind.inv <- sort(ind, decreasing=T)
val <- rep(1,length(ind))
new.x <- vector(mode="numeric",length(x)+length(val))
new.x <- new.x[-ind]
new.x[ind] <- val
prob <- new.x
if (odd(i)) {
output[i] <- prob
}
print(output)
}
}
```

However I need to return this list of vectors from my function rather than printing it and when I do so, I get the following output and am met with an error and a number of warnings:

```
[[1]]
[1] 0
[[1]]
[1] 0
[[1]]
[1] 0
[[2]]
NULL
[[3]]
[1] 1
[[1]]
[1] 0
[[2]]
NULL
[[3]]
[1] 1
[[1]]
[1] 0
[[2]]
NULL
[[3]]
[1] 1
[[4]]
NULL
[[5]]
[1] 0
Error in new.x[-ind] : only 0's may be mixed with negative subscripts
In addition: Warning messages:
1: In output[i] <- prob :
number of items to replace is not a multiple of replacement length
2: In output[i] <- prob :
number of items to replace is not a multiple of replacement length
3: In output[i] <- prob :
number of items to replace is not a multiple of replacement length
```

My question is: How can I change my code to output what I need from this function? I thought this was going to be a five minute job, and after hours on this one little thing I am stuck!

Thanks in advance