R ggplot2 y-axis scale

Question

I tried to change y-axis scale range.
I used the code to set the y scale:

coord_cartesian(ylim = c(min(value) - 0.05, max(value) + 0.05))

where value is a numeric column.
I want the y-axis showing from the minimum of value minus 0.05 to maximum of value plus 0.05 with the breaks of 0.05.
However, coord_cartesian() does not work. Alternatively, I tried scale_y_continuous(breaks(min(value) - 0.05, max(value) + 0.05, 0.05)), it does not work either.

How to edit my code?

Have you tried the `expand` argument in your scale? – camille May 23 '19 at 19:23 — camille, May 23 '19 at 19:23
I haven't heart that before. Could you explain more on it? – Peter Chen May 23 '19 at 19:28 — Peter Chen, May 23 '19 at 19:28

Jon Spring · Accepted Answer · 2019-05-23T19:42:22.370

2

EDIT: original approach used coord_cartesian, but to specify breaks will need scale_y_continuous.

# Making fake data with similar range
mtcars$wt = mtcars$wt/6 + 0.7

ggplot(mtcars, aes(mpg, wt)) + 
  geom_point() +
  scale_y_continuous(breaks = 0.05*0:1000,
                     expand = expand_scale(add = 0.06)) # adjust to taste

edited May 23 '19 at 19:42

answered May 23 '19 at 18:50

Jon Spring

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score 0 · Answer 2 · answered May 23 '19 at 18:45

0

you can use ylim()

library(ggplot2)
data(mtcars)

ggplot(data = mtcars,
       aes(x = hp,
           y = mpg,
           color = cyl
           )
       ) +
  geom_point() +
  ylim(min(mtcars$mpg) - 0.05, max(mtcars$mpg) + 0.05)

EDIT: I forgot to incorporate the max(value) + 1 component, which is now included

answered May 23 '19 at 18:45

Graeme Frost

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Not work as I want. This just limits the y-axis but the labels on y-axis does not show properly – Peter Chen May 23 '19 at 19:31

score 0 · Answer 3 · answered May 23 '19 at 20:31

0

Try this:

+ scale_y_continuous(breaks = seq(min(value) - 0.05, max(value) + 0.05, by = 0.05))

answered May 23 '19 at 20:31

caszboy

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`Error in seq(min(value) - 0.05, max(value) + 0.05, by = 0.05) : object 'value' not found` – Peter Chen May 23 '19 at 20:41
It seems that we cannot use column in `scale_y_continuous` – Peter Chen May 23 '19 at 20:42
Did you try to use your table$value? – caszboy May 23 '19 at 21:06

R ggplot2 y-axis scale

3 Answers3