如何在 plotly 中为子图中的所有图强制使用相同的颜色？
在下面的示例中，我在一个可绘制的子图中有四个箱线图。此示例中的四个箱形图均具有 3 个变量：股票、债券和现金。在每个箱线图中，我希望股票以相同颜色（例如蓝色）显示，债券以相同颜色（例如红色）显示，现金以第三种颜色显示。下面的代码使我有 12 种颜色，而不是 3 种颜色。我做了一个简单的例子。在我的实际问题中，变量的数量将在运行时确定，因此我无法轻松地对颜色进行硬编码。我想调用一个调色板。
library(RColorBrewer)
library(plotly)
set.seed(101)
tbl1y <- data.frame(stocks = rnorm(1000,10,15),
bonds = rnorm(1000, 7, 8),
cash = rnorm(1000,3,1))
tbl3y <- data.frame(stocks = rnorm(1000,10,15*0.75),
bonds = rnorm(1000, 7, 8*0.75),
cash = rnorm(1000,3,1*0.75))
tbl5y <- data.frame(stocks = rnorm(1000,10,15*0.5),
bonds = rnorm(1000, 7, 8*0.5),
cash = rnorm(1000,3,1*0.5))
tbl10y <- data.frame(stocks = rnorm(1000,10,15*0.25),
bonds = rnorm(1000, 7, 8*0.25),
cash = rnorm(1000,3,1*0.25))
create_1boxplot <- function(tbl, n, vnames){
mypalette <- brewer.pal(length(vnames), "Dark2")
p <- plot_ly(data = tbl, type="box")
for(i in vnames){
p <- p %>%
add_trace(y = tbl[,i], name = i)
}
a<-list(text=paste("Boxplot of", n, "Year Returns"),
xref = "paper",
yref = "paper",
yanchor = "bottom",
xanchor = "center",
color = vnames,
colors = mypalette,
align = "left",
valign = "top",
x = 0.5,
y = 1,
showarrow = FALSE)
p <- p %>% layout(annotations=a)
return(p)
}
vnames <- c("stocks", "bonds", "cash")
p1 <- create_1boxplot(tbl1y, 1, vnames = vnames)
p3 <- create_1boxplot(tbl3y, 3, vnames = vnames)
p5 <- create_1boxplot(tbl5y, 5, vnames = vnames)
p10 <- create_1boxplot(tbl10y, 10, vnames = vnames)
subplot(p1, p3, p5, p10, titleX=FALSE, titleY=FALSE, nrows=2, margin=0.05) %>%
layout(showlegend = FALSE,
yaxis = list(title = ""),
xaxis = list(title = ""))
