R：保存为 PDF 时可以修复图例吗？

发布于 2024-12-17 15:32:00 字数 605 浏览 0 评论 0原文

运行此代码时

plot(c(0,1), c(0, 1), type = "n")
legend("topleft", legend = c("Model", "Data"),
           lwd = c(3, NA),
           pch = c(NA, 16),
           bty = "n", inset = 0.02,
           cex = 2)

当我按预期，我看到以下内容： Nice legend

但是，当我将其包装在 pdf("legendTest.pdf") .. . dev.off()，保存的PDF有一条穿过该点的线。

extra line

我可以更正这个问题，还是需要以其他格式保存？我使用的是 Mac，使用预览和 Chrome 查看 PDF 时出现问题。我下载了 Adobe Reader 看看它做了什么，然后图例文本和 pch 点消失了，只留下模型线。

原文

When I run this code

plot(c(0,1), c(0, 1), type = "n")
legend("topleft", legend = c("Model", "Data"),
           lwd = c(3, NA),
           pch = c(NA, 16),
           bty = "n", inset = 0.02,
           cex = 2)

as expected, I see this:
Nice legend

However, when I wrap it in pdf("legendTest.pdf") ... dev.off(), the saved PDF has a line through the point.

extra line

Can I correct this, or do I need to just save in another format? I'm on a Mac, and the problem is present viewing the PDF using Preview and Chrome. I downloaded Adobe Reader to see what it did, and then the legend text and pch point disappeared, leaving only the model line.

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清音悠歌 2024-12-24 15:32:00

您可以通过显式设置线类型（参数 lty）来解决此问题，如下所示：

plot(c(0,1), c(0, 1), type = "n")
legend("topleft", legend = c("Model", "Data"),
       lwd = c(3, NA),
       lty = c(1, 0), # 0=blank, 1=solid (default). See ?par for more.
       pch = c(NA, 16),
       bty = "n", inset = 0.02,
       cex = 2)

编辑

lwd 参数的文档，位于 ?par 解释说：

'lwd' 线宽，正数，默认为“1”。这
解释是特定于设备的，有些设备没有
实现小于一的线宽。

Mac 的默认 R 图形设备一定是其中之一。（FWIW，使用您的代码，我自己的 Windows 图形设备确实显示一条穿过数据点的线，就像在 pdf 中一样。）

无论如何，看起来使用 通常更安全lty 比 lwd 来控制这个特定的细节。

You can fix this by explicitly setting the line type (argument lty), like this:

plot(c(0,1), c(0, 1), type = "n")
legend("topleft", legend = c("Model", "Data"),
       lwd = c(3, NA),
       lty = c(1, 0), # 0=blank, 1=solid (default). See ?par for more.
       pch = c(NA, 16),
       bty = "n", inset = 0.02,
       cex = 2)

EDIT

The documentation for the lwd argument, in ?par explains that:

'lwd' The line width, a positive number, defaulting to '1'. The
interpretation is device-specific, and some devices do not
implement line widths less than one.

Mac's default R graphical device must be one of those. (FWIW, with your code, my own Windows graphics device does show a line through the data point, just as in the pdf.)

In any case, it looks like it's generally safer to use lty than lwd to control this particular detail.

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