second y-axis with other scale [duplicate]

问题

I created a barchart with ggplot2 geom_bar and want to have two metrics in the bars. I used melt to do so. However, I now need a second y-axis with another scale, because the numbers of the two metrics are too different.

In the following the dataframe and the code I used:

df <- data.frame(categories = c("politics", "local", "economy", "cultural events", 
                                "politics", "local", "economy", "cultural events"), 
               metric = c("page", "page", "page", "page", 
                          "product", "product", "product", "product"), 
               value = c(100L, 50L, 20L, 19L, 
                         950000L, 470000L, 50000L, 1320L))

In the following the code I used to create the plot and the second y-axis:

x <- ggplot(df, aes(x=categories, y=value, fill = metric))
x + geom_bar(stat = "identity", position = "dodge") +
  scale_y_continuous(sec.axis=sec_axis(~. *1000), limits=c(1,1000))

However, now no bars appear in the chart anymore... Does anybody know how to solve this problem?

回答1:

Another approach could be to use highcharter

library(dplyr)
library(tidyr)
library(highcharter)

#convert your data in wide format
df <- df %>% spread(metric, value)

#plot
highchart() %>% 
  hc_xAxis(categories = df$categories) %>%
  hc_yAxis_multiples(
    list(lineWidth = 3, title = list(text = "Page")),
    list(opposite = TRUE, title = list(text = "Product"))
  ) %>% 
  hc_add_series(type = "column", data = df$page) %>% 
  hc_add_series(type = "line", data = df$product, yAxis=1) # replace "line" with "column" to have it in bar format

Output plot is:

Sample data:

df <- structure(list(categories = structure(c(4L, 3L, 2L, 1L, 4L, 3L, 
2L, 1L), .Label = c("cultural events", "economy", "local", "politics"
), class = "factor"), metric = structure(c(1L, 1L, 1L, 1L, 2L, 
2L, 2L, 2L), .Label = c("page", "product"), class = "factor"), 
    value = c(100L, 50L, 20L, 19L, 950000L, 470000L, 50000L, 
    1320L)), .Names = c("categories", "metric", "value"), row.names = c(NA, 
-8L), class = "data.frame")

回答2:

Instead of displaying the different bars on the same plot you can stack them together (or facet them):

As @ConorNeilson already mentioned in the comments, you don't have to (and also shouldn't) specify the variables with df$. ggplot knows to look for them in the specified data.frame df.
The free_y argument in the facet_grid-call makes it possible to display different scales on the y-axes.

library(ggplot2)
ggplot(df, aes(x = categories, y = value, fill = metric)) + 
  geom_bar(stat = "identity", position = "dodge") +
  facet_grid(metric~., scales = "free_y")

You could compare the different values on a log10-scale:

ggplot(df, aes(x = categories, y = value, fill = metric)) + 
  geom_bar(stat = "identity", position = "dodge") +
  scale_y_log10(name = "value (log10 scale)", 
                breaks = 10^(0:10), labels = paste0(10, "^", 0:10))

来源：https://stackoverflow.com/questions/50248016/second-y-axis-with-other-scale

标签

ggplot2

scale

geom-bar

yaxis