如何在没有原始降价输出的情况下使用编织块将元素添加到绘图中? [英] How to add elements to a plot using a knitr chunk without original markdown output?

问题描述

出于记录目的，我想要html输出中用于绘图的一些代码，而不是绘图.稍后，我必须调用绘图代码，并在绘图中添加一些内容，但只能看到其他代码.我尝试过:

For documentary purposes, I want some code for a plot in the html-output, but not the plot. Later, I have to call the plotting code, and add something to the plot, but only seeing the additional code. I tried this:

```{r non.finished.plotting, eval=FALSE}
    plot(1,type="n")
```
Some explanatory text here in the output:
"This produces an empty plot, and we could now add some points to it manually."

```{r add.layer, fig.width=5, fig.height=5}
<<non.finished.plotting, echo=FALSE>>
points(x=rnorm(100,1,0.1), y=rnorm(100,0.8,0.1) )

```

我在 Yihui的处找到了回显符号，但是当我将其编织时，我收到一条错误消息输出.

I have found the echo-notation at Yihui's, but when I knit this, I get an error message in the output.

## Error: plot.new has not been called yet

我还尝试摆弄 chunk选项，但是我找不到能满足我需求的组合. (对不起，这是非常基本的内容，但是我没有找到类似此示例的内容.)

I also tried fiddling with the chunk options, but I could not find a combination which does what I want. (Sorry, this is very basic, but I did not find something quite like this example.)

推荐答案

<<>>中的块引用不考虑块选项，因此<<non.finished.plotting, echo=FALSE>>将不起作用.您可以做的是将块选项echo移回主块，如下所示:

Chunk references in <<>> do not respect chunk options, so <<non.finished.plotting, echo=FALSE>> will not work. What you can do is to move the chunk option echo back to the main chunk like this:

```{r add.layer, fig.width=5, fig.height=5, echo=-1}
<<non.finished.plotting>>
points(x=rnorm(100,1,0.1), y=rnorm(100,0.8,0.1) )
```

echo=-1表示不回显第一个表达式(如已记录).这可能就是您想要的:

echo=-1 means do not echo the first expression (as documented). This is probably what you want:

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