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How to convert days in a week to number in R data frame column?
To convert days in a week to number in R data frame column, we would need to convert the column into a factor by defining the weekdays as the levels and then read that column as integer.
If we provide the correct sequence of weekdays during conversion then Monday will be converted to 1. Check out the below Examples to understand how it can be done.
Example 1
Following snippet creates a sample data frame −
Week_Days<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df1<-data.frame(Week_Days)
df1The following dataframe is created
Week_Days 1 Friday 2 Monday 3 Tuesday 4 Saturday 5 Thursday 6 Tuesday 7 Monday 8 Thursday 9 Thursday 10 Friday 11 Thursday 12 Sunday 13 Thursday 14 Tuesday 15 Wednesday 16 Sunday 17 Friday 18 Wednesday 19 Sunday 20 Thursday
To convert Week_Days in df1 to number and reading them in a different column on the above created data frame, add the following code to the above snippet −
Week_Days<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df1<-data.frame(Week_Days)
df1$Days_Number<-
as.integer(factor(df1$Week_Days,levels=c("Monday","Tuesday","Wednesday","Thursd
ay","Friday","Saturday","Sunday"),ordered=TRUE))
df1The following dataframe is created
Week_Days Days_Number 1 Friday 5 2 Monday 1 3 Tuesday 2 4 Saturday 6 5 Thursday 4 6 Tuesday 2 7 Monday 1 8 Thursday 4 9 Thursday 4 10 Friday 5 11 Thursday 4 12 Sunday 7 13 Thursday 4 14 Tuesday 2 15 Wednesday 3 16 Sunday 7 17 Friday 5 18 Wednesday 3 19 Sunday 7 20 Thursday 4
Example 2
Following snippet creates a sample data frame −
Time<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df2<-data.frame(Time)
df2
The following dataframe is created
Time 1 Tuesday 2 Thursday 3 Monday 4 Tuesday 5 Thursday 6 Sunday 7 Saturday 8 Monday 9 Thursday 10 Saturday 11 Wednesday 12 Monday 13 Wednesday 14 Sunday 15 Sunday 16 Sunday 17 Sunday 18 Wednesday 19 Saturday 20 Friday
To convert Time in df2 to number and reading them in a different column on the above created data frame, add the following code to the above snippet −
Time<-
sample(c("Monday","Tuesday","Wednesday","Thursday","Friday","Saturday","Sunday"),20,replace=TRUE)
df2<-data.frame(Time)
df2$Day_Number<-
as.integer(factor(df2$Time,levels=c("Monday","Tuesday","Wednesday","Thursday","
Friday","Saturday","Sunday"),ordered=TRUE))
df2
Output
If you execute all the above given snippets as a single program, it generates the following Output −
Time Day_Number 1 Tuesday 2 2 Thursday 4 3 Monday 1 4 Tuesday 2 5 Thursday 4 6 Sunday 7 7 Saturday 6 8 Monday 1 9 Thursday 4 10 Saturday 6 11 Wednesday 3 12 Monday 1 13 Wednesday 3 14 Sunday 7 15 Sunday 7 16 Sunday 7 17 Sunday 7 18 Wednesday 3 19 Saturday 6 20 Friday 5
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