Why does an object named
first_time appear in the global environment when I show
I tried to debug this to figure out where it gets created, but all I managed to figure out is that it shows up inexplicably while inside
I see one mention on the support site in this post: A: Strange first_time object in rtracklayer import. However, this object is created even while running in a vanilla session of R in the terminal.
Here is my (hopefully) reproducible example:
gr <- GenomicRanges::GRanges( seqnames = "chr2", ranges = IRanges::IRanges(3, 6), strand = "+") grl <- GenomicRanges::split(gr, "chr2") # creates a GRangesList object ls() ##  "gr" "grl" grl # Show/print the object ls() ##  "first_time" "gr" "grl" sessionInfo() version 3.3.2 (2016-10-31) Platform: x86_64-apple-darwin13.4.0 (64-bit) Running under: macOS Sierra 10.12.2 locale:  en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8 attached base packages:  stats graphics grDevices utils datasets methods base loaded via a namespace (and not attached):  zlibbioc_1.20.0 IRanges_2.8.1 XVector_0.14.0  parallel_3.3.2 GenomicRanges_1.26.1 S4Vectors_0.12.1  BiocGenerics_0.20.0 GenomeInfoDb_1.10.1 stats4_3.3.2