I recently opened a standard Rmd file without editing anything. The default file looks like this:

Untitled.rmd

---

title: "myfile"

author: "Me"

date: "May 25, 2015"

output: html_document

fontsize: 12pt

---

This is an R Markdown document. Markdown is a simple formatting syntax for authoring HTML, PDF, and MS Word documents. For more details on using R Markdown see .

When you click the **Knit** button a document will be generated that includes both content as well as the output of any embedded R code chunks within the document. You can embed an R code chunk like this:

```{r}

summary(cars)

```

You can also embed plots, for example:

```{r, echo=FALSE}

plot(cars)

```

Note that the `echo = FALSE` parameter was added to the code chunk to prevent printing of the R code that generated the plot.

I wanted to create an html file corresponding to the above file so in a separate R script I did the following:

knit('Untitled.Rmd', 'doc.md')

markdownToHTML('doc.md', 'testing.html',header = TRUE)

For some reason the font size doesn't work and the header information that I was hoping for doesn't appear in my testing.html. Anyone know why this is happening?

解决方案

This is what I used to control font size and color in an R-markdown file. It basically overrides the CSS style sheets without having to create a new file. The example changes the sizes of the headers and titles, as well as the inline text and the R-code text, and sets some colors as well.

In my case I needed to pack more information into a document that had a specified number of pages so I made everything smaller.

---

title: "This is a title"

date: 25 May 2015

output:

html_document:

theme: cerulean

---

body{ /* Normal */

font-size: 12px;

}

td { /* Table */

font-size: 8px;

}

h1 { /* Header 1 */

font-size: 28px;

color: DarkBlue;

}

h2 { /* Header 2 */

font-size: 22px;

color: DarkBlue;

}

h3 { /* Header 3 */

font-size: 18px;

color: DarkBlue;

}

code.r{ /* Code block */

font-size: 10px;

}

pre { /* Code block */

font-size: 10px

}

Update:

Added more more styles, comments, and a bit of color to make this answer more useful