CODEWITHSUNDEEP
rmerge
DanielvL
DanielvL

Reputation: 30

How to merge two rows into one in R?

I'm looking for a solution in R for merging pairs of rows into one.

Task Starttime Endtime
Programming 13:35 13:50
Programming 14:00 15:40
Production 15:45 16:00
QualityInspection 16:15 16:30
QualityInspection 16:45 17:00 
library(tidyverse)

df <- data.frame('Task' = c('Promgramming', 'Programming', 'Production', 'QualityInspection', 'QualityInspection'), 
                'Starttime' = c('13:35', '14:00', '15:45', '16:15', '16:45'), 
                'Endtime' = c('13:50', '15:40', '16:00', '16:30', '17:00'))

My desired table is the following:

Task Starttime Endtime
Programming 13:35 15:40
Production 15:45 16:00
QualityInspection 16:15 17:00

Tasks always come in pairs of two or one.

How can I achieve this?

Upvotes: 0

Views: 61

Answers (2)

akrun
akrun

Reputation: 887891

Using data.table

library(data.table)
setDT(df)[, .(Starttime = first(Starttime), Endtime = last(Endtime)), Task]

Upvotes: 0

Ronak Shah
Ronak Shah

Reputation: 389265

For each Task you can extract first Starttime and last EndTime.

library(dplyr)

df %>%
  group_by(Task) %>%
  summarise(Starttime = first(Starttime), 
            Endtime = last(Endtime))

# Task              Starttime Endtime
#  <chr>             <chr>     <chr>  
#1 Production        15:45     16:00  
#2 Programming       13:35     15:40  
#3 QualityInspection 16:15     17:00

data

df <- structure(list(Task = c("Programming", "Programming", "Production", 
"QualityInspection", "QualityInspection"), Starttime = c("13:35", 
"14:00", "15:45", "16:15", "16:45"), Endtime = c("13:50", "15:40", 
"16:00", "16:30", "17:00")), class = "data.frame", row.names = c(NA, -5L))

Upvotes: 2

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