Ggplot doesn't take an Empty dataset what to do?

great, GREAT, GREAT it just worked..

I don't know why it didn't work yesterday...I had some problem with tidy verse yesterday (Unable to load tidyverse).

I used this code and it worked like magic...

    cum %between% c(20.01,40),'green',ifelse(
        cum %between% c(40.01,49),'orange','red')

fulldata %>% 
    geom_hline(yintercept = 50,linetype=3)        

Thanks a lot for helping me out. Thank you very much.

There is one more thing I want to know. Is there a way I can relate my alpha level to colors... this is a subset of data. I will have to plot like 800 some people on the graph and I want to highlight only the orange and red part of the line... Is there a way I can dynamically control the alpha level of these lines. Please do reply. I really want to use this code in production as it is much easier to understand.

And just for reference where can I learn how to use this interaction formula in ggplot2. I never knew something like that exists...