Error in sample.int(length(x), size, replace, prob) : invalid first argument

Question

I am running the following lines of code and facing the above-mentioned error. Any ideas how to fix this ?

install.packages("operator.tools")    
X <- NULL
S <- NULL
remove.valuex <- NULL
N <- seq.int(1,25)

library(operator.tools)

repeat {

S<-sample(N ,1, replace = FALSE, prob = NULL)
S
if (S==1) {
remove.value<-c(S,S+1)
} else if (S==25) {
remove.value<-c(S,S-1)
}else {remove.value<-c(S-1,S,S+1)
}
remove.value

N <- N [which(N %!in% remove.value)]          
N

if (is.null(N)) break
}

Solution 1

It actually works as you intend. You can see it if you insert print(N)

> repeat{

    S<-sample(N ,1, replace = FALSE, prob = NULL)
    S
    if (S==1) {
        remove.value<-c(S,S+1)
    } else if (S==25) {
        remove.value<-c(S,S-1)
    }else {remove.value<-c(S-1,S,S+1)
    }
    remove.value

    N <- N [which(N %!in% remove.value)]          
    print(N)

    if (is.null(N)) break
}
 [1]  1  2  3  4  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 [1]  1  2  3  4  8  9 10 11 12 13 14 15 16 17 18 19 20 21 25
 [1]  1  2  3  4  8  9 13 14 15 16 17 18 19 20 21 25
 [1]  1  2  3  4  8  9 13 14 15 16 17 18 25
 [1]  1  2  3  4  8  9 16 17 18 25
[1]  1  2  3  4  8  9 25
[1]  1  2  8  9 25
[1]  8  9 25
[1] 8 9
integer(0)
Error in sample.int(length(x), size, replace, prob) : 
  invalid first argument

The error is caused by the final value of N, which is integer(0), and not NULL. If you use if (length(N)== 0) break instead of if (is.null(N)) break the code works without error message.

Solution 2

Removing the library Tidyverse solved this issue for me. The problem seems to be RStudio calling the sample.int() instead of simply sample(). Cheers!

Comments

[Hope]

I am seeing an inconsistent behaviour from R studio. I am still seeing the error despite trying to use RStudent's suggestion: X <- 0 S <- NULL remove.valuex <- NULL N <- seq.int(1,25) repeat{ S<-sample(N ,1, replace = FALSE, prob = NULL) print(S) if (S==1) { remove.value<-c(S,S+1) } else if (S==25) { remove.value<-c(S,S-1) }else {remove.value<-c(S-1,S,S+1) } remove.value N <- N[which(!N %in% remove.value)] print(N) X <- X+1 print(X) if (length(N)== 1) break }

[DatamineR]

I'm using RStudio too, and it works for me. Do you get the same error?

[Hope]

Yep the same error but every now and then depending on the random sample I guess.

[JMichael]

I'm getting the same error. The biggest source of confusion for me is that the error message mentions sample.int, and I'm using sample. So it looks like either it's just a sloppy error message, or RStudio is trying to use the wrong function.

[Jakob]

same problem and that didn't help for me. Also, sample.int() is baseR