Initial version of cheat sheet.
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name = "Impressum"
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name = "Impressum"
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url = "impressum/"
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url = "impressum/"
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weight = 30
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weight = 30
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[[menu.main]]
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name = "Cheat sheet"
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url = "cheatsheet/"
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weight = 15
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content/cheatsheet.md
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content/cheatsheet.md
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---
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title: bovender's personal cheat sheet
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description: >
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On this page, I collect bits and pieces of information that I
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never seem to be able to memorize. This stuff is helpful for me
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and maybe it is helpful for you, too, internet wanderer.
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date: 2024-11-05T08:00:00+0100
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draft: false
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---
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{{< git-info >}}
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{{< param "description" >}}
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## R
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### Print R objects so that they can be re-generated from code
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```r
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# dput takes an R object
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dput(x, file = "", control = c("keepNA", "keepInteger", "niceNames", "showAttributes"))
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dget(file, keep.source = FALSE)
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# dump takes a list of R object names
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dump(list, file = "dumpdata.R", append = FALSE, control = "all", envir = parent.frame(), evaluate = TRUE)
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```
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Example:
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``` r
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library(dplyr)
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my_data <-
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starwars |>
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select(species, homeworld)
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dput(my_data)
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#> structure(list(species = c("Human", "Droid", "Droid", "Human",
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#> "Human", "Human", "Human", "Droid", "Human", "Human", "Human",
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#> "Human", "Wookiee", "Human", "Rodian", "Hutt", "Human", NA, "Yoda's species",
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#> "Human", "Human", "Droid", "Trandoshan", "Human", "Human", "Mon Calamari",
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#> "Human", "Human", "Ewok", "Sullustan", "Human", "Neimodian",
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#> "Human", "Human", "Gungan", "Gungan", "Gungan", "Human", "Toydarian",
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#> "Dug", "Human", "Human", "Zabrak", "Twi'lek", "Twi'lek", "Aleena",
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#> "Vulptereen", "Xexto", "Toong", "Human", "Cerean", "Nautolan",
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#> "Zabrak", "Tholothian", "Iktotchi", "Quermian", "Kel Dor", "Chagrian",
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#> NA, NA, "Human", "Geonosian", "Mirialan", "Mirialan", "Human",
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#> "Human", "Human", "Human", "Clawdite", "Besalisk", "Kaminoan",
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#> "Kaminoan", "Human", "Droid", "Skakoan", "Muun", "Togruta", "Kaleesh",
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#> "Wookiee", "Human", NA, "Pau'an", "Human", "Human", "Human",
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#> "Droid", "Human"), homeworld = c("Tatooine", "Tatooine", "Naboo",
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#> "Tatooine", "Alderaan", "Tatooine", "Tatooine", "Tatooine", "Tatooine",
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#> "Stewjon", "Tatooine", "Eriadu", "Kashyyyk", "Corellia", "Rodia",
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#> "Nal Hutta", "Corellia", "Bestine IV", NA, "Naboo", "Kamino",
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#> NA, "Trandosha", "Socorro", "Bespin", "Mon Cala", "Chandrila",
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#> NA, "Endor", "Sullust", NA, "Cato Neimoidia", "Coruscant", "Naboo",
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#> "Naboo", "Naboo", "Naboo", "Naboo", "Toydaria", "Malastare",
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#> "Naboo", "Tatooine", "Dathomir", "Ryloth", "Ryloth", "Aleen Minor",
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#> "Vulpter", "Troiken", "Tund", "Haruun Kal", "Cerea", "Glee Anselm",
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#> "Iridonia", "Coruscant", "Iktotch", "Quermia", "Dorin", "Champala",
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#> "Naboo", "Naboo", "Tatooine", "Geonosis", "Mirial", "Mirial",
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#> "Naboo", "Serenno", "Alderaan", "Concord Dawn", "Zolan", "Ojom",
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#> "Kamino", "Kamino", "Coruscant", NA, "Skako", "Muunilinst", "Shili",
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#> "Kalee", "Kashyyyk", "Alderaan", "Umbara", "Utapau", NA, NA,
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#> NA, NA, NA)), row.names = c(NA, -87L), class = c("tbl_df", "tbl",
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#> "data.frame"))
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```
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<sup>Created on 2024-11-05 with [reprex v2.1.1](https://reprex.tidyverse.org)</sup>
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### Calculate percentages of subgroups
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Principle: `Group` the dataset and `summarize` by counting (`n()`), drop the last group
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while doing so, then `mutate` the dataset by adding the count divided by the sum of counts.
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Hint to better understand the example: Look at the sexes in black-eyed subjects.
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``` r
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library(dplyr)
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starwars |>
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group_by(eye_color, gender) |>
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summarize(n = n(), .groups = "drop_last") |>
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mutate(p = n/sum(n))
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#> # A tibble: 23 × 4
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#> # Groups: eye_color [15]
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#> eye_color gender n p
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#> <chr> <chr> <int> <dbl>
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#> 1 black feminine 2 0.2
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#> 2 black masculine 8 0.8
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#> 3 blue feminine 6 0.316
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#> 4 blue masculine 12 0.632
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#> 5 blue <NA> 1 0.0526
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#> 6 blue-gray masculine 1 1
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#> 7 brown feminine 4 0.190
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#> 8 brown masculine 15 0.714
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#> 9 brown <NA> 2 0.0952
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#> 10 dark masculine 1 1
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#> # ℹ 13 more rows
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```
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<sup>Created on 2024-11-05 with [reprex v2.1.1](https://reprex.tidyverse.org)</sup>
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