I am trying to follow the instructions here on how to create a dual y-axis plot (yes, I know). My code is here.

我试图按照这里的说明来创建一个双y轴图(是的，我知道)。我的代码在这里。

However, in the output some of the major grid lines are slightly misaligned (see the red box), whereas some of them are perfectly aligned. I am not sure what is causing this dilation of one of the plots. I rewrote the code on that site to understand it better and have possibly introduced a bug somewhere.

然而，在输出中，一些主要的网格线有轻微的偏差(看红色的方块)，而有些则是完全对齐的。我不知道是什么导致了其中一个情节的扩大。我重写了该站点上的代码，以便更好地理解它，并可能在某个地方引入了一个bug。

An easy fix would be to turn off grid lines on one of the plots, but that seems to be hiding the problem rather than fixing it.

一个简单的解决办法是在其中一个地块上关闭网格线，但这似乎隐藏了问题，而不是解决问题。

Edit:

I tried running the original code here unchanged, and I ran into the following error on line 130.

我尝试在这里运行原始代码不变，然后在第130行中遇到了下面的错误。

> ticks$grobs[[1]]$x <- ticks$grobs[[1]]$x - unit(1, "npc") + tml
Error in Ops.unit(ticks$grobs[[1]]$x, unit(1, "npc")) : 
  both operands must be units

So, I cannot check if the issue is a bug that I have introduced while transcription.

所以，我不能检查这个问题是不是我在转录过程中引入的bug。

1 个解决方案

#1

Your code in the gist doesn't run (and it's also a bit complicated).

您的代码在gist中没有运行(而且它也有点复杂)。

To understand why the lines aren't aligned, consider this example:

要理解为什么这些行没有对齐，请考虑以下示例:

axis1: range: 0 - 1. The value of 0.5 is mid-way between 0 and 1.
axis1:范围:0 - 1。0。5的值在0和1之间。
axis2: range: 0 - 10. The value of 5 is mid-way between 0 and 10.
axis2:范围:0 - 10。5的值在0和10之间。

Now in your graph you have (something like)

在你的图表中

axis1: range: 0 - 1.1. The value of 0.5 is 0.5/1.1 = 0.45 between 0 and 1.
axis1:范围:0 - 1.1。0.5的值为0.5/1.1 = 0.45，介于0和1之间。
axis2: range: 0 - 10.1. The value of 5 is 5/10.1 = 0.495 between 0 and 10.
axis2:范围:0 - 10.1。5的值是5/10.1 = 0.495，在0到10之间。
Result: mis-aligned lines.
结果:mis-aligned线。

You shouldn't add a constant to each axis, the value needs to be proportional to the scale.

你不应该在每一个轴上加上一个常数，这个值需要与这个比例成比例。

#1