Description Usage Arguments See Also Examples
This annotation adds log tick marks with diminishing spacing. These tick marks probably make sense only for base 10.
1 2 3 4 |
base |
the base of the log (default 10) |
sides |
a string that controls which sides of the plot the log ticks appear on.
It can be set to a string containing any of |
scaled |
is the data already log-scaled? This should be |
short |
a |
mid |
a |
long |
a |
colour |
Colour of the tick marks. |
size |
Thickness of tick marks, in mm. |
linetype |
Linetype of tick marks ( |
alpha |
The transparency of the tick marks. |
color |
An alias for |
... |
Other parameters passed on to the layer |
scale_y_continuous()
, scale_y_log10()
for log scale
transformations.
coord_trans()
for log coordinate transformations.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | # Make a log-log plot (without log ticks)
a <- ggplot(msleep, aes(bodywt, brainwt)) +
geom_point(na.rm = TRUE) +
scale_x_log10(
breaks = scales::trans_breaks("log10", function(x) 10^x),
labels = scales::trans_format("log10", scales::math_format(10^.x))
) +
scale_y_log10(
breaks = scales::trans_breaks("log10", function(x) 10^x),
labels = scales::trans_format("log10", scales::math_format(10^.x))
) +
theme_bw()
a + annotation_logticks() # Default: log ticks on bottom and left
a + annotation_logticks(sides = "lr") # Log ticks for y, on left and right
a + annotation_logticks(sides = "trbl") # All four sides
# Hide the minor grid lines because they don't align with the ticks
a + annotation_logticks(sides = "trbl") + theme(panel.grid.minor = element_blank())
# Another way to get the same results as 'a' above: log-transform the data before
# plotting it. Also hide the minor grid lines.
b <- ggplot(msleep, aes(log10(bodywt), log10(brainwt))) +
geom_point(na.rm = TRUE) +
scale_x_continuous(name = "body", labels = scales::math_format(10^.x)) +
scale_y_continuous(name = "brain", labels = scales::math_format(10^.x)) +
theme_bw() + theme(panel.grid.minor = element_blank())
b + annotation_logticks()
# Using a coordinate transform requires scaled = FALSE
t <- ggplot(msleep, aes(bodywt, brainwt)) +
geom_point() +
coord_trans(x = "log10", y = "log10") +
theme_bw()
t + annotation_logticks(scaled = FALSE)
# Change the length of the ticks
a + annotation_logticks(
short = unit(.5,"mm"),
mid = unit(3,"mm"),
long = unit(4,"mm")
)
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