[英]Create a dataframe with a column that will include unique values of a column and unique column names of another dataframe
[英]Create an R dataframe containing the counts of unique values in another dataframe column
我有一個 R 數據框,如下所示:
ID number Code
D001 F11
D001 F12
F002 D13
F002 F11
E003 C12
我想轉換成這樣的數據幀,每個 ID(鍵)的每個代碼都有計數:
ID number F11 F12 D13 C12
D001 1 1 0 0
F002 1 0 1 0
E003 0 0 0 1
最簡單的方法是table
並將其強制轉換為data.frame
as.data.frame.matrix(table(df1))
C12 D13 F11 F12
D001 0 0 1 1
E003 1 0 0 0
F002 0 1 1 0
或者使用pivot_wider
的tidyr
library(tidyr)
library(dplyr)
df1 %>%
pivot_wider(names_from = Code, values_from = Code,
values_fn = length, values_fill = 0)
-輸出
# A tibble: 3 x 5
IDnumber F11 F12 D13 C12
<chr> <int> <int> <int> <int>
1 D001 1 1 0 0
2 F002 1 0 1 0
3 E003 0 0 0 1
df1 <- structure(list(IDnumber = c("D001", "D001", "F002", "F002", "E003"
), Code = c("F11", "F12", "D13", "F11", "C12")), class = "data.frame", row.names = c(NA,
-5L))
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