Axes will not start at 0 in ggplot-CodePudding

I have just created my first bubble chart in ggplot and, despite trying just about every 'solution' I could find on the internet for the past few hours, I have not been able to force the axes to start at 0. The x and y axes both start at 10 but I would like the axes to start at 0. I have tried using various combination of xlim, ylim, expand_limits, scale_y_continuous and scale_x_continuous with no luck.

Here's the code I use to create the graph:

ggplot(mean_diffs, aes(x=sample, y=marked, size = pop_est))   
  geom_point(alpha=0.7)   scale_size(range = c(2, 10), name="Absolute error", breaks = c(5,10,20,40))

Any help would be greatly appreciated to restore my sanity!

CodePudding user response：

It's not clear what exactly you tried, but the following seems to work well, assuming your data are all numeric:

ggplot(mean_diffs, aes(x = sample, y = marked, size = pop_est))   
  geom_point(alpha = 0.7)   
  scale_size(range = c(2, 10), name = "Absolute error", 
             breaks = c(5, 10, 20, 40))  
  scale_x_continuous(limits = c(0, 60), breaks = 0:6 * 10)  
  scale_y_continuous(limits = c(0, 60), breaks = 0:6 * 10)

Reproducible data set, inferred from plot in question

mean_diffs <- data.frame(sample = rep(c(10, 30, 50), each = 3),
                         marked = rep(c(10, 30, 50), 3),
                         pop_est = c(30, 20, 10, 40, 20, 3, 30, 7, 3))