I am working with a dataframe data
which is similar in structure to the one below.
Gender Age Number
1 Female 55-59 years 5
2 Female 65+ years 10
3 Male 25-29 years 4
4 Male 40-44 years 3
5 Male 50-54 years 1
I am attempting to reshape the data (unsuccessfully thus far) using tidyr so that each value of the Number
column is featured on its own line. The output I am seeking should resemble the following:
Gender Age
1 Female 55-59 years
2 Female 55-59 years
3 Female 55-59 years
4 Female 55-59 years
5 Female 55-59 years
6 Female 65+ years
7 Female 65+ years
8 Female 65+ years
9 Female 65+ years
10 Female 65+ years
11 Female 65+ years
12 Female 65+ years
13 Female 65+ years
14 Female 65+ years
15 Female 65+ years
16 Male 25-29 years
17 Male 25-29 years
18 Male 25-29 years
19 Male 25-29 years
20 Male 40-44 years
21 Male 40-44 years
22 Male 40-44 years
23 Male 50-54 years
I have tried to use various combinations of the gather/spread functions without coming even remotely close to success. I'm fairly sure this is possible in tidyr!
I know there are a number of other packages/functions that I could use to achieve the same result, but I'm quite keen to get a tidyr solution so I can include it in a larger dplyr/tidyr pipe.
Any help of assistance would be very much appreciated.
dat <- structure(list(Gender = structure(c(3L, 3L, 1L, 2L, 1L), .Label = c(" Male",
" Male", "Female"), class = "factor"), Age = structure(c(5L,
1L, 2L, 3L, 4L), .Label = c("65+ years", "25-29 years", "40-44 years",
"50-54 years", "55-59 years"), class = "factor"), Number = c(5L,
10L, 4L, 3L, 1L)), .Names = c("Gender", "Age", "Number"), class = "data.frame", row.names = c(NA,
-5L))
This is also not using tidyr, but I think it's natural:
dat %>% slice(rep(row_number(), Number)) %>% select(-Number)
Gender Age
1 Female 55-59 years
2 Female 55-59 years
3 Female 55-59 years
4 Female 55-59 years
5 Female 55-59 years
6 Female 65+ years
7 Female 65+ years
8 Female 65+ years
9 Female 65+ years
10 Female 65+ years
11 Female 65+ years
12 Female 65+ years
13 Female 65+ years
14 Female 65+ years
15 Female 65+ years
16 Male 25-29 years
17 Male 25-29 years
18 Male 25-29 years
19 Male 25-29 years
20 Male 40-44 years
21 Male 40-44 years
22 Male 40-44 years
23 Male 50-54 years
As @bramtayl suggested, one can (arguably) improve readability with
dat %>% slice(row_number() %>% rep(Number)) %>% select(-Number)
Not tidyr but pretty fast and efficient:
dat2 <- dat[rep(1:nrow(dat), dat[["Number"]]), 1:2]
rownames(dat2) <- NULL
## Gender Age
## 1 Female 55-59 years
## 2 Female 55-59 years
## 3 Female 55-59 years
## 4 Female 55-59 years
## 5 Female 55-59 years
## 6 Female 65+ years
## 7 Female 65+ years
## 8 Female 65+ years
## 9 Female 65+ years
## 10 Female 65+ years
## 11 Female 65+ years
## 12 Female 65+ years
## 13 Female 65+ years
## 14 Female 65+ years
## 15 Female 65+ years
## 16 Male 25-29 years
## 17 Male 25-29 years
## 18 Male 25-29 years
## 19 Male 25-29 years
## 20 Male 40-44 years
## 21 Male 40-44 years
## 22 Male 40-44 years
## 23 Male 50-54 years
We could do this using tidyr/dplyr
. Convert the 'Number' to a list
column after changing the values to sequence, unnest
and remove the 'Number' column from the output with select
.
library(dplyr)
library(tidyr)
dat1 <- dat %>%
mutate(Number= lapply(Number, seq)) %>%
unnest(Number) %>%
select(-Number)
Note that the output will be a tbl_df
which would be useful when we are performing other operations using the dplyr
functions.
str(dat1)
# Classes ‘tbl_df’, ‘tbl’ and 'data.frame': 23 obs. of 2 variables:
# $ Gender: Factor w/ 3 levels " Male"," Male",..: 3 3 3 3 3 3 3 3 3 3 ...
# $ Age : Factor w/ 5 levels "65+ years","25-29 years",..: 5 5 5 5 5 1 1 1 1 1 ...
dat1 %>%
as.data.frame()
# Gender Age
#1 Female 55-59 years
#2 Female 55-59 years
#3 Female 55-59 years
#4 Female 55-59 years
#5 Female 55-59 years
#6 Female 65+ years
#7 Female 65+ years
#8 Female 65+ years
#9 Female 65+ years
#10 Female 65+ years
#11 Female 65+ years
#12 Female 65+ years
#13 Female 65+ years
#14 Female 65+ years
#15 Female 65+ years
#16 Male 25-29 years
#17 Male 25-29 years
#18 Male 25-29 years
#19 Male 25-29 years
#20 Male 40-44 years
#21 Male 40-44 years
#22 Male 40-44 years
#23 Male 50-54 years
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