[英]Plot subsets of one variable on x-y axis (avoid spreading/reshaping data frame)
我想知道是否可以在xy軸上繪制一個變量的行子集而不必擴展/整形數據框?
library(tidyverse)
id <- 1:6
size <- c(5, 2, 3, 4, 2, 8)
colour <- rep(c("red", "blue", "green"), 2)
df <- data.frame(id, size, colour)
x11()
ggplot(data = filter(df, colour %in% c("blue", "red")),
aes(x = size[colour == "blue"],
y = size[colour == "red"])) +
geom_point()
是的,有可能。 一種解決方案是直接將向量提交給aes
(IMO這是ggplot2
濫用,但是現在我想不出任何其他解決方案)。
# Subset data once so we wouldn't need to subset twice for nrow
id <- 1:6
size <- c(5, 2, 3, 4, 2, 8)
colour <- rep(c("red", "blue", "green"), 2)
df <- data.frame(id, size, colour)
pd <- subset(df, colour %in% c("blue", "red"))
# Use dummy empty data.frame
library(ggplot2)
ggplot(data.frame(),
# Submit x,y values as vectors that go every second entry
aes(pd$size[seq(2, nrow(pd), 2)], pd$size[seq(1, nrow(pd), 2)])) +
geom_point()
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