I also can't reproduce this. I'd guess that one of your values of n.per.grp or n.tt only prints as the values you showed, but is actually a little smaller. For example,

n.per.grp <- 108 - 1.e-14
n.per.grp
#> [1] 108
n.tt <- 5
n.per.grp*n.tt
#> [1] 540
length(rep(0:1, each=n.per.grp*n.tt))
#> [1] 1078

Duncan Murdoch


<sup>Created on 2024-08-15 with [reprex v2.1.1](https://reprex.tidyverse.org)</sup>

On 2024-08-15 2:39 p.m., Izmirlian, Grant (NIH/NCI) [E] via R-help wrote:
\n<<SEND AS PLAIN TEXT!>>\n\n \n<<
This is very weird. I was running a swarm job on the cluster and it bombed
only for n.per.grp=108, not for the other values. Even though
n.per.grp*n.tt is 540, so that the length of the call to 'rep'
should be 1080, I'm getting a vector of length 1078.
     n.per.grp <- 108
     n.tt <- 5
     n.per.grp*n.tt
     length(rep(0:1, each=n.per.grp*n.tt))
     length(rep(0:1, each=108*5))
\n<<Grant Izmirlian grant.izmirlian at nih dot gov>>\n\n\n\n
--please do not edit the information below--

R Version:
  platform = x86_64-pc-linux-gnu
  arch = x86_64
  os = linux-gnu
  system = x86_64, linux-gnu
  status =
  major = 4
  minor = 4.1
  year = 2024
  month = 06
  day = 14
  svn rev = 86737
  language = R
  version.string = R version 4.4.1 (2024-06-14)
  nickname = Race for Your Life

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