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October 26, 2022 19:44
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Pivot longer and wider using R
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| # from SO post at https://stackoverflow.com/questions/72922418/create-rows-from-part-of-column-names/72939299 | |
| library(readr) | |
| library(tidyr) | |
| library(dplyr) | |
| library(knitr) | |
| so_blurb <- | |
| "id|Date (05/19/2020)|Type (05/19/2020)|Date (06/03/2020)|Type (06/03/2020)|Type (10/23/2020|Date (10/23/2020)|Type (10/23/2020) | |
| 10629465|null|null|06/01/2020|E | |
| 98765432|05/18/2020|B||||10/26/2020|T | |
| " | |
| wider <- | |
| so_blurb |> | |
| read_delim( | |
| , col_types = cols(.default = col_character()) | |
| , delim = "|" | |
| , trim_ws = TRUE | |
| ) |> | |
| mutate(across(.fns = function(x) recode(x, .missing = ""))) | |
| wider |> kable(format = "markdown") | |
| #|id |Date (05/19/2020) |Type (05/19/2020) |Date (06/03/2020) |Type (06/03/2020) |Type (10/23/2020 |Date (10/23/2020) |Type (10/23/2020) | | |
| #|:--------|:-----------------|:-----------------|:-----------------|:-----------------|:----------------|:-----------------|:-----------------| | |
| #|10629465 |null |null |06/01/2020 |E | | | | | |
| #|98765432 |05/18/2020 |B | | | |10/26/2020 |T | | |
| # two step pivot - longer first, then wider | |
| longer <- | |
| wider |> | |
| # first step | |
| pivot_longer( | |
| , cols = !c("id") | |
| , names_to = c("Column", "ActivityDate") | |
| , names_pattern = "(.*?)\\s+[(](.*?)[)]" | |
| , values_to = "DateOrLetter" | |
| ) |> | |
| filter(DateOrLetter != "") |> | |
| # second step | |
| pivot_wider( | |
| , id_cols = c(1, 2) | |
| , names_from = "Column" | |
| , values_from = "DateOrLetter" | |
| ) |> | |
| # convert data types and nulls | |
| mutate( | |
| , ActivityDate = readr::parse_date(ActivityDate, "%m/%d/%Y") | |
| , Date = readr::parse_date(Date, "%m/%d/%Y") | |
| , Type = recode(Type, "null" = NA_character_) | |
| ) | |
| longer |> kable(format = "markdown") | |
| #|id |ActivityDate |Date |Type | | |
| #|:--------|:------------|:----------|:----| | |
| #|10629465 |2020-05-19 |NA |NA | | |
| #|10629465 |2020-06-03 |2020-06-01 |E | | |
| #|98765432 |2020-05-19 |2020-05-18 |B | | |
| #|98765432 |2020-10-23 |2020-10-26 |T | |
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