Increase number of axis ticks

Question

I m generating plots for some data  but the number of ticks is too small  I need more precision on the reading   Is there some way to increase the number of axis ticks in ggplot2   I know I can tell ggplot to use a vector as axis ticks  but what I want is to increase the number of ticks  for all data  In other words  I want the tick number to be calculated from the data   Possibly ggplot do this internally with some algorithm  but I couldn t find how it does it  to change according to what I want

User · Answer

Based on Daniel Krizian s comment  you can also use the pretty breaks function from the scales library  which is imported automatically   ggplot dat  aes x y     geom point     scale x continuous breaks   scales  pretty breaks n   10     scale y continuous breaks   scales  pretty breaks n   10     All you have to do is insert the number of ticks wanted for n     A slightly less useful solution  since you have to specify the data variable again   you can use the built-in pretty function   ggplot dat  aes x y     geom point     scale x continuous breaks   pretty dat x  n   10     scale y continuous breaks   pretty dat y  n   10

User · Answer

You can override ggplots default scales by modifying scale x continuous and or scale y continuous  For example   library ggplot2  dat  lt - data frame x   rnorm 100   y   rnorm 100    ggplot dat  aes x y       geom point     Gives you this     And overriding the scales can give you something like this   ggplot dat  aes x y       geom point       scale x continuous breaks   round seq min dat x   max dat x   by   0 5  1       scale y continuous breaks   round seq min dat y   max dat y   by   0 5  1       If you want to simply  zoom  in on a specific part of a plot  look at xlim   and ylim   respectively  Good insight can also be found here to understand the other arguments as well

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The upcoming version v3 3 0 of ggplot2 will have an option n breaks to automatically generate breaks for scale x continuous and scale y continuous      devtools  install github  tidyverse ggplot2        library ggplot2       plt  lt - ggplot mtcars  aes x   mpg  y   disp           geom point        plt          scale x continuous n breaks   5          plt          scale x continuous n breaks   10          scale y continuous n breaks   10

User · Answer

You can supply a function argument to scale  and ggplot will use that function to calculate the tick locations   library ggplot2  dat  lt - data frame x   rnorm 100   y   rnorm 100   number ticks  lt - function n   function limits  pretty limits  n    ggplot dat  aes x y       geom point       scale x continuous breaks number ticks 10       scale y continuous breaks number ticks 10

User · Answer

Additionally   ggplot dat  aes x y     geom point     scale x continuous breaks   seq min dat x   max dat x   by   0 05     Works for binned or discrete scaled x-axis data  I e   rounding not necessary

[r] Increase number of axis ticks

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