R图中的线应在其他时间点开始 [英] Line in R plot should start at a different timepoint

问题描述

我有以下示例数据集：

date<-c(1,2,3,4,5,6,7,8)
valuex<-c(2,1,2,1,2,3,4,2)
valuey<-c(2,3,4,5,6)

现在我绘制日期和valuex变量：

now I plot the date and the valuex variable:

plot(date,valuex,type="l")

现在，我想添加一行有价值的变量，但是它应该从第4天开始，所以不要在开始时，因此我要添加NA值：

now, I want to add a line of the valuey variable, but it should start with the 4th day, so not at the beginning, therefore I add NA values:

valuexmod<-c(rep(NA,3),valuex)

，然后添加以下行：

lines(date,valuexmod,type="l",col="red")

但这不起作用吗？ R忽略了NA值，而valuexmod行从第一天开始，但是应该从第四天开始？

But this does not work? R ignores the NA values and the valuexmod line starts with the first day, but it should start with th 4th day?

推荐答案

给出 date 和 valuex 的长度相同，我假设您上面有一个错字。

Given that date and valuex have the same length, I am assuming that you have a typo above.

尝试以下操作：

date <- c(1, 2, 3, 4, 5, 6, 7, 8)
valuex <- c(2, 1, 2, 1, 2, 3, 4, 2)
valuey <- c(2, 3, 4, 5, 6)
valueymod <- c(rep(NA, 3), valuey)

plot(date, valuex, type = "l", ylim = range(c(valuex, valuey)))
lines(date, valueymod, type = "l", col = "red")

这是结果图：

与您的问题有关的是help（ lines）...

Related to your question is a point made in help("lines")...

坐标可以包含NA值。如果一个点的x或y值都包含NA，则将其从图中省略，并且不会在此类点上绘制线或从此类点绘制线。因此，缺失值可用于实现换行。

The coordinates can contain NA values. If a point contains NA in either its x or y value, it is omitted from the plot, and lines are not drawn to or from such points. Thus missing values can be used to achieve breaks in lines.

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