R指定线图的x轴刻度 [英] R specifying x-axis ticks for a line plot

问题描述

我有一些时间序列，其中200个值与一个时间间隔内的200个不同时间相关联.绘制线图后，我想手动告诉R仅显示我指定的某些特定值的x轴刻度.然后，我想指定一个不同的名称，即日期字符串，在这些刻度上绘制而不是数值.我已经看过axis()，但是在将整个过程组合在一起时遇到了麻烦.我希望绘制整个折线图，而不仅仅是我指定的x标签.

I have some time series with 200 values associated with 200 different times within an interval. After plotting the line plot, I would like to manually tell R to only show x axis ticks for some specific values I specify. Then, I would like to specify a different name, ie a date string, to be plotted at these ticks instead of the numerical value. I've looked at axis() but i'm having trouble putting this whole process together. I want the entire line graph to be plotted, not just the x labels i'm specifying.

例如: 如果我有: y = c(227，342，121，275，354，999，221，475，867，347，541) x = c(1，5，10，15，20，25，30，35，40，45，50)

For example: If i have: y = c(227, 342, 121, 275, 354, 999, 221, 475, 867, 347, 541) x = c(1, 5, 10, 15, 20, 25, 30 ,35, 40, 45, 50)

我想要plot(x，y，"l")，但x轴仅在c(10，30，40)处滴答.对于这些刻度，我想分别关联c("March"，"June"，"August")，并将这些名称作为这三个刻度的标签.

I want plot(x, y, "l") but with x axis ticks only at c(10, 30, 40). For these ticks, I would like to associate c("March", "June", "August") respectively and have these names as the labels for these three ticks.

推荐答案

您将需要使用手动轴创建方法.可以通过(1)禁用自动轴创建(在对plot的调用中使用xaxt='n')和(2)对axis函数进行自定义调用来实现.

You will need to resort to the manual axis creation. This can be done by (1) disabling the automatic axis creation (with xaxt='n' in the call to plot) and (2) make a custom call to the axis function.

这是我要进行的操作:

y = c(227, 342, 121, 275, 354, 999, 221, 475, 867, 347, 541)
x = c(1, 5, 10, 15, 20, 25, 30 ,35, 40, 45, 50)
plot(x, y, "l", xaxt='n')
axis(1,at=c(10,30,40),labels=c("March", "June", "August"))

结果如下图所示:

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