R ggplot2-geom_point自定义颜色范围和颜色 [英] R ggplot2 - geom_point custom color ranges and colors

问题描述

我正在尝试通过函数归纳我通常需要的一组图-我无法在其中正确地获取某些方面.

I'm trying to generalize a set of plots I regularly need through a function - I have trouble in getting some aspects right in there.

myCustomScatter <- function(df, col_x, col_y, col_z){
  p1 <- ggplot(df, aes(x=df[,col_x]))
  p1 <- p1 + geom_point(aes(y=df[,col_y], color=df[,col_z]))
  p1 <- p1 + scale_x_continuous(name=colnames(df)[col_x])
  p1 <- p1 + scale_y_continuous(name=colnames(df)[col_y])
  return(p1)
}

df1 <- data.frame(a=seq(1.1,9.9,1.1), b=seq(0.1,0.9,0.1), c=rev(seq(10.1, 99.9, 11.1)))

myCustomScatter(df1, 1, 2, 3)

这给出了以下预期的图.

This gives the following plot as expected.

1. 我需要根据 df [，3] 值离散颜色范围-我需要 blue 值> 90， green 表示90> =值> 70，黄色表示70> =值> 55， orange 表示55> =值> 25& red 的值< = 25-如何指定此值?

1. I need the color ranges to be discrete based on df[,3] values- I need blue for value > 90, green for 90 >= value > 70, yellow for 70 >= value > 55, orange for 55 >= value > 25 & red for value <= 25 - how do I specify this ?

我需要图例的标题，而不是 df [，col_z] 是 c ，可以通过 colnames(df1)[3] -我该如何指定?

I need the title of the legend instead of df[,col_z] to be c which I can get through colnames(df1)[3] - how do I specify this ?

推荐答案

您可以尝试以下操作:

myCustomScatter <- function(df, col_x, col_y, col_z){
  p1 <- ggplot(df, aes_string(x=df[,col_x], color = cut(df[,col_z], c(-Inf, 25, 55, 70, 90, Inf))), size = 6)
  p1 <- p1 + geom_point(aes_string(y=df[,col_y]))
  p1 <- p1 + scale_x_continuous(name=colnames(df)[col_x])
  p1 <- p1 + scale_y_continuous(name=colnames(df)[col_y]) # + guides(color=guide_legend('c'))
  p1 <- p1 + scale_color_manual(name = names(df)[col_z],
                                values = c("red",
                                           "orange",
                                           "yellow",
                                           "green",
                                           "blue"))
  return(p1)
}

df1 <- data.frame(a=seq(1.1,9.9,1.1), b=seq(0.1,0.9,0.1), c=rev(seq(10.1, 99.9, 11.1)))

myCustomScatter(df1, 1, 2, 3)

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