Plotly scatterternary - 连续色彩美学的问题答案

【问题标题】：Plotly scatterternary - problems with continuous color aestheticsPlotly scatterternary - 连续色彩美学的问题
【发布时间】：2023-04-05 12:26:01
【问题描述】：

我在 R 中使用 plotly 创建三元图时发现了一个问题。如果颜色美学是一个连续变量，则三元图在背景中似乎有一个二元图。离散的色彩美学似乎效果很好。有人知道解决方法吗？

library(tidyverse)
library(plotly)



# Make a dataframe

df<-data.frame(ID = 1:6,
                ID2 = c(rep("B14",4),"B16","B16"),
                Location = c(40.9,96,120,308.5,322,420),
                Classifier = c(rep("A",3),rep("B",3)),
                A = c(0.06,0.06,0.02,0.02,0.01,0.01),
                B = c(0.04,0.01,0.03,0.04,0.02,0.06),
                C= c(0.26,0.06,0.43,0.35,0.29,0.74),
                X = c(363,696,757,1650,609,392)
                )

离散颜色的三元示例

# Colours by discrete variable work fine 

df %>% 
  plot_ly(
    a = ~A,
    b = ~B,
    c = ~C,
    text = ~ID,
    color = ~Classifier,
    colors = "Set1",
    type = 'scatterternary',
    mode = 'markers',
    marker = list( 
      symbol ='circle',
      opacity = 0.6,
      size = 15
    ))

连续变量的颜色在三元背景中创建两个附加轴。

df %>% 
  plot_ly(
    a = ~A,
    b = ~B,
    c = ~C,
    text = ~ID,
    color = ~X,
    colors = "Spectral",
    type = 'scatterternary',
    mode = 'markers',
    marker = list( 
      symbol ='circle',
      opacity = 0.6,
      size = 15
    ))

【问题讨论】：

标签： r plotly r-plotly

【解决方案1】：

这不是解决办法 - 更多的是解决问题。您可以像这样隐藏 x 和 y 轴：

ax <- list(
  title = "",
  zeroline = FALSE,
  showline = FALSE,
  showticklabels = FALSE,
  showgrid = FALSE
)

# use your df:
df %>% 
  plot_ly(
    a = ~A,
    b = ~B,
    c = ~C,
    text = ~ID,
    color = ~X,
    colors = "Spectral",
    type = 'scatterternary',
    mode = 'markers',
    marker = list( 
      symbol ='circle',
      opacity = 0.6,
      size = 15
    )) %>%
  layout(xaxis = ax, yaxis = ax)

【讨论】：