Question

I would like to use ggplot2 for this but have no idea where to look. I have a global start and end time min(begin) and max(end) respectively which is my x axis. My y axis would be each processor and my data includes for each processor the time chunks where the compiler would be busy compiling or linking a specific file. I would like to see the empty areas where a Processor is idle. My df would look like this:

df <- data.frame(proc = as.factor(c('P_1', 'P_1', 'P_1', 'P_2', 'P_2', 'P_3')), begin=c(1, 20, 23 , 3, 5, 8), end=c(5, 19, 21, 4, 9, 100), what=c('compiling A', 'compiling B', 'linking A', 'compiling C', 'compiling D', 'compiling E'))
df
> df
  proc begin end        what
1  P_1     1   5 compiling A
2  P_1    20  19 compiling B
3  P_1    23  21   linking A
4  P_2     3   4 compiling C
5  P_2     5   9 compiling D
6  P_3     8 100 compiling E
> 

How can I do that?

Answer 1

Something like this?

library(ggplot2)
ggplot(df, aes(x=begin, xend=end, y=proc, yend=proc, colour=what)) + 
  geom_segment(size=5)