#219–220

Puzzles

Author: ExcelBI

All files (xlsx with puzzle and R with solution) for each and every puzzle are available on my Github. Enjoy.

Puzzle #219

Somebody make request for equipment for new employees. But we have little mess here, if two devices with the same OS is needed it looks, like D1, D2 — OS1, and if we have two devices of the same type but on different OS it will look like D1 — OS1, OS2. There is no easy way just to separate them. But it is not impossible, check it.

Loading libraries and data

library(tidyverse)
library(readxl)

path = "Power Query/PQ_Challenge_219.xlsx"
input = read_excel(path, range = "A1:B7")
test  = read_excel(path, range = "D1:F12")

Transformation

devices = c("Laptop", "Desktop", "Mobile")

result = input %>%
  separate_rows(Machine, sep = ", ") %>%
  separate(Machine, into = c("Device", "OS"), sep = " - ",remove = FALSE) %>%
  mutate(OS = case_when(
    is.na(OS) & Device %in% devices ~ lead(OS,1),
    is.na(OS) & !Device %in% devices ~ Device,
    TRUE ~ OS),
    Device = case_when(
      !Device %in% devices ~ lag(Device,1),
      TRUE ~ Device)) %>%
  select(-Machine)

Validation

identical(result, test)
#> [1] TRUE

Puzzle #220

And once again we have puzzle based on project management. We have list of activities, but we need to find a way to see it all in context of months. Some table transformation is needed to achieve it, so let us start it.

Load libraries and data

library(tidyverse)
library(readxl)

path = "Power Query/PQ_Challenge_220.xlsx"
input = read_excel(path, range = "A1:D9")
test  = read_excel(path, range = "A13:I18") %>% replace(is.na(.), "")

Transformation

result = input %>%
  mutate(Start = floor_date(Start, "month"),
         Finish = floor_date(Finish, "month")) %>%
  mutate(seq = map2(Start, Finish, seq, by = "month")) %>%
  unnest(seq) %>%
  select(-Start, -Finish) %>%
  mutate(rn = row_number(), .by = c("Project", "seq")) %>%
  pivot_wider(names_from = seq, values_from = Activities, values_fill = "") %>%
  select(-rn)

names(result) = names(test)

Validation

result == test
# two cells in wrong order. 

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PowerQuery Puzzle solved with R was originally published in Numbers around us on Medium, where people are continuing the conversation by highlighting and responding to this story.