根据计算在数据框中插入行

Question

我是R的新手,我正在尝试将Excel中完成的计算复制到R.
我有一个这样的数据框:

Component <- c("A", "B", "C")
Report_Time <- c(5781, 5781, 5781)
Interval <- c(700, 600, 800)
End_Time <- c(8281, 8281, 8281)
Start_Time <- c(800, 298, 780)
df <- data.frame(Component, Report_Time, Interval, End_Time, Start_Time)

印刷时它看起来像这样:

# Component Report_Time Interval    End_Time    Start_Time
#1    A         5781        700         8281        800
#2    B         5781        600         8281        298
#3    C         5781        800         8281        780

对于每个组件,我想填充计算列"Interval_Time",它是First的开始时间+ Report_Time的总和,然后如果它小于End_Time,则插入一个具有Interval_Time(Last sum)+ Interval之和的行.重复插入,直到Interval time中的和小于End_Time.

# Component Report_Time Interval    End_Time    Start_Time  Interval_Time
#1   A       5781       700             8281        800         6581
#2   A       5781       700             8281        800         7281
#3   A       5781       700             8281        800         7981
#4   B       5781       1000            8281        298         6079        
#5   B       5781       1000            8281        298         7079
#6   B       5781       1000            8281        298         8079
#7   C       5781       1200            8281        780         6561
#8   C       5781       1200            8281        780         7761

如果在for循环中,我一直试图实现这一点..但是还没有成功.

Answer 1

和data.table：

Component <- c("A", "B", "C")
Report_Time <- c(5781, 5781, 5781)
Interval <- c(700, 1000, 1200)
End_Time <- c(8281, 8281, 8281)
Start_Time <- c(800, 298, 780)
df <- data.frame(Component, Report_Time, Interval, End_Time, Start_Time)

library(data.table)
setDT(df)
df<-df[rep(1:.N,ceiling((End_Time-Start_Time-Report_Time)/Interval))]
df[,Interval_Time:=ifelse(.I==1,Start_Time+Report_Time,Start_Time+cumsum(Interval)+Report_Time-Interval),by=.(Component)]

df
Component Report_Time Interval End_Time Start_Time Interval_Time
1:         A        5781      700     8281        800          6581
2:         A        5781      700     8281        800          7281
3:         A        5781      700     8281        800          7981
4:         B        5781     1000     8281        298          6079
5:         B        5781     1000     8281        298          7079
6:         B        5781     1000     8281        298          8079
7:         C        5781     1200     8281        780          6561
8:         C        5781     1200     8281        780          7761