I use ggplot2 to display data, and use the function "scale_fill_distiller" to display continuous color bar. However, I want to increase the interval from every 100 to every 200 in the color bar, how to do this? The target variable is annual precipitation, so from 0 to 2000 mm.
Also, how to increase the length of the color bar so that the numbers will be displayed clearly. I display the color bar as horizontal rather than vertical, so that the numbers such as 100, 200, 300, etc. are clumped together and hard to differentiate. Thanks for your help