Resizing images in RMarkdown

Question

I'm trying to convert a R markdown .Rmd document to .pdf. Unfortunately, the images are too large. Is there any way to change the size of the image? I Can't use html, this is markdown to pdf.

Answer 1

Use this at the beginning of a chunk:

Decimals assigned to fig.height and fig.width are interpreted as inches. Other units of measure also allowed if explicit.

```{r, echo=FALSE, fig.height=2.7, fig.width=9}
#your R code here
```

Answer 2

I found a comfortable solution by the combination of fig.height, fig.width, dpi and out.width.

You can set global parameters at the top by:

knitr::opts_chunk$set(out.width="400px", dpi=120)

You can overwrite these properties in any chunk, just set the parameters you need.

dpi increases the quality image, so you have to adjust by the other parameters.

out.width adjust the size once the image is created.

Decreasing values in fig.height and fig.width will cause the text/numbers to be bigger (same as reducing image window in Rstudio)