Sys.setenv(rndseed = 1234)
x <- rnorm(5)
Sys.setenv(rndseed = 1234)
y <- rnorm(5)
x
#> [1] 0.5844919 -0.1095672 -0.6967544 0.1256577 -0.3469113
y
#> [1] 0.008266097 -0.161057916 -1.264698031 0.040473454 -0.204031586
identical(x, y)
#> [1] FALSE
# vs set.seed
set.seed(1234)
x2 <- rnorm(5)
set.seed(1234)
y2 <- rnorm(5)
x2
#> [1] -1.2070657 0.2774292 1.0844412 -2.3456977 0.4291247
y2
#> [1] -1.2070657 0.2774292 1.0844412 -2.3456977 0.4291247
identical(x2, y2)
#> [1] TRUECreated on 2026-03-02 with reprex v2.1.1
Session info
sessioninfo::session_info()
#> ─ Session info ───────────────────────────────────────────────────────────────
#> setting value
#> version R version 4.5.2 (2025-10-31)
#> os macOS Tahoe 26.2
#> system aarch64, darwin20
#> ui X11
#> language (EN)
#> collate en_US.UTF-8
#> ctype en_US.UTF-8
#> tz Australia/Hobart
#> date 2026-03-02
#> pandoc 3.6.3 @ /Applications/Positron.app/Contents/Resources/app/quarto/bin/tools/aarch64/ (via rmarkdown)
#> quarto 1.7.31 @ /Applications/quarto/bin/quarto
#>
#> ─ Packages ───────────────────────────────────────────────────────────────────
#> package * version date (UTC) lib source
#> cli 3.6.5 2025-04-23 [1] CRAN (R 4.5.0)
#> digest 0.6.39 2025-11-19 [1] CRAN (R 4.5.2)
#> evaluate 1.0.5 2025-08-27 [1] CRAN (R 4.5.0)
#> fastmap 1.2.0 2024-05-15 [1] CRAN (R 4.5.0)
#> fs 1.6.6 2025-04-12 [1] CRAN (R 4.5.0)
#> glue 1.8.0 2024-09-30 [1] CRAN (R 4.5.0)
#> htmltools 0.5.9 2025-12-04 [1] CRAN (R 4.5.2)
#> knitr 1.51 2025-12-20 [1] CRAN (R 4.5.2)
#> lifecycle 1.0.5 2026-01-08 [1] CRAN (R 4.5.2)
#> otel 0.2.0 2025-08-29 [1] CRAN (R 4.5.0)
#> reprex 2.1.1 2024-07-06 [1] CRAN (R 4.5.0)
#> rlang 1.1.7 2026-01-09 [1] CRAN (R 4.5.2)
#> rmarkdown 2.30 2025-09-28 [1] CRAN (R 4.5.0)
#> sessioninfo 1.2.3 2025-02-05 [1] CRAN (R 4.5.0)
#> withr 3.0.2 2024-10-28 [1] CRAN (R 4.5.0)
#> xfun 0.56 2026-01-18 [1] CRAN (R 4.5.2)
#> yaml 2.3.12 2025-12-10 [1] CRAN (R 4.5.2)
#>
#> [1] /Users/nick_1/Library/R/arm64/4.5/library
#> [2] /Library/Frameworks/R.framework/Versions/4.5-arm64/Resources/library
#>
#> ──────────────────────────────────────────────────────────────────────────────