The context of the data is that I am quantifying an assay where lower number is better. So I want lower number to be high up on the Y axis and my bars starting from bottom going up. However, when I use scale_Y_reverse, bars start from the top. How can I achieve what I want?
Scale_Y_reverse makes bars start from top not from bottom. I want it to be from the bottom.
o <- data.frame('Time'=c(24,48),'Count'=c(20,40)) ggplot(o, aes(x=as.factor(Time),y=Count)) + geom_col() + scale_y_reverse()
ggplot is pretty strict about bars starting at 0, since that’s almost universally a good idea. Unless 40 is a super special value for some reason, this plot is likely going to confuse a lot of people.
But I think you can do what you want by plotting:
ggplot(o, aes(x=as.factor(Time), y= 40 - Count)) + geom_col() + scale_y_continuous(labels = \(x) 40 - x, limits = c(0, 40))