按頻率對圖表進行垂直條形圖排序

Question

我想根據x軸上的定量變量的水平對垂直條形圖進行排序。

重複的例子：

library(plotly) 
library(dplyr) 

df <- data.frame(a = c(1000,100,500,1), b = c('blue', 'green', 'yellow', 'red')) 

plot_ly(
    data = df, 
    x = ~a, 
    y = ~b, 
    type = 'bar', 
    orientation = 'h' 
) %>% 
    layout(
     yaxis = list(
      categoryorder = "array", 
      categoryarray = ~a 
      ) 
     ) 

所以我希望有一個垂直條形圖，其中在y軸的順序向下是：「藍色」，「黃色」，「綠色」和「紅色」。我閱讀了關於類別訂單，這似乎是一個很好的解決方案，但不知何故它不是在實踐中工作。

Answer 1

選項1

library(plotly) 
library(dplyr) 

df <- data.frame(a = c(1000,100,500,1), b = c('blue', 'green', 'yellow', 'red')) 
df$b = factor(df$b,levels =c("red","green","yellow", "blue")) 

plot_ly(
    data = df, 
    x = ~a, 
    y = ~b, 
    type = 'bar', 
    orientation = 'h' 
) 

選項2

library(plotly) 
library(dplyr) 

df <- data.frame(a = c(1000,100,500,1), b = c('blue', 'green', 'yellow', 'red')) 

plot_ly(
    data = df, 
    x = ~a, 
    y = ~b, 
    type = 'bar', 
    orientation = 'h' 
) %>% 
    layout(
    yaxis = list(
     categoryorder = "array", 
     categoryarray = ~c("red","green","yellow", "blue")) 
    ) 
) 

希望這有助於！