在具有 3 个 y 轴的单个图中绘制 4 条曲线 [英] Plot 4 curves in a single plot with 3 y-axes
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问题描述
我有 4 组值:y1、y2、y3、y4 和一组 x.y 值具有不同的范围,我需要将它们绘制为单独的曲线,在 y 轴上具有单独的一组值.
I have 4 sets of values: y1, y2, y3, y4 and one set x. The y values are of different ranges, and I need to plot them as separate curves with separate sets of values on the y-axis.
简单来说,我需要 3 个具有不同值(比例)的 y 轴来绘制同一个图形.
To put it simple, I need 3 y-axes with different values (scales) for plotting on the same figure.
推荐答案
试试这个....
# The data have a common independent variable (x)
x <- 1:10
# Generate 4 different sets of outputs
y1 <- runif(10, 0, 1)
y2 <- runif(10, 100, 150)
y3 <- runif(10, 1000, 2000)
y4 <- runif(10, 40000, 50000)
y <- list(y1, y2, y3, y4)
# Colors for y[[2]], y[[3]], y[[4]] points and axes
colors = c("red", "blue", "green")
# Set the margins of the plot wider
par(oma = c(0, 2, 2, 3))
plot(x, y[[1]], yaxt = "n", xlab = "Common x-axis", main = "A bunch of plots on the same graph",
ylab = "")
lines(x, y[[1]])
# We use the "pretty" function go generate nice axes
axis(at = pretty(y[[1]]), side = 2)
# The side for the axes. The next one will go on
# the left, the following two on the right side
sides <- list(2, 4, 4)
# The number of "lines" into the margin the axes will be
lines <- list(2, NA, 2)
for(i in 2:4) {
par(new = TRUE)
plot(x, y[[i]], axes = FALSE, col = colors[i - 1], xlab = "", ylab = "")
axis(at = pretty(y[[i]]), side = sides[[i-1]], line = lines[[i-1]],
col = colors[i - 1])
lines(x, y[[i]], col = colors[i - 1])
}
# Profit.
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