CODEWITHSUNDEEP
rggplot2histogram
jeffgoblue
jeffgoblue

Reputation: 319

R ggplot scale_fill_gradient2 on histogram vs dotplot

I'm in ggplot2 applying scale_fill_gradient2 on single variable. geom_histogram() is my default approach, but I'd like to use geom_dotplot(). When I widen my x-axis, the fill on the histogram maps to my axis limits (which is desired), but when plotting the same data using dotplot, the fill maps to the min/max of the data regardless of the x-axis limits. Sample Code:

### Use the Iris Data
df <- iris

### Basic ggplot setup
p <- ggplot(df, aes(x=Sepal.Length)) 


## Histogram -- fill scales with my axis limits (desired)
p + geom_histogram(color="black",
aes(fill = ..x..)) +
scale_x_continuous(limits=c(2,10))+
scale_fill_gradient2(
    low = "blue", high = "red",
    mid = "white", midpoint=6)

Historgram with properly-scaled fill

In other words, the fill scale matches the scale_x_continuous command and produces the fill result I desire. However, change the word "histogram" to "dotplot" (and nothing else), and the fill scale sticks purely with the min/max of the data. What I want is the dotplot with the histogram fill.

### Dot Plot -- fill scales purely with min/max of data
### I want the same shading as in the histogram
p + geom_dotplot(color="black",
aes(fill = ..x..)) +
scale_x_continuous(limits=c(2,10))+
scale_fill_gradient2(
    low = "blue", high = "red",
    mid = "white", midpoint=6

Dotplot with min-max fill scale

Ultimately, the goal here is to have the dotplot fill/scale match that of the histogram. Thanks!

Upvotes: 2

Views: 905

Answers (1)

Allan Cameron
Allan Cameron

Reputation: 174278

You can set the limits in scale_fill_gradient2:

p + geom_dotplot(color="black",
aes(fill = ..x..)) +
scale_x_continuous(limits = c(2, 10))+
scale_fill_gradient2(
    low = "blue", high = "red",
    mid = "white", midpoint = 6, 
    limits = c(2, 10))

enter image description here

Upvotes: 2

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