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This is an example of using **knitr** with extended markdown (e.g. [GFM](http://github.github.com/github-flavored-markdown/)) and uploading images to imgur.com automatically. Note you should set the graphical device to create images that can be displayed in the web browser, e.g. `dev = 'png'` (it is the default for markdown output) works but `'pdf'` does not.
First, the input file was named as `knitr-upload.Rmd` ([source](https://github.com/yihui/knitr-examples/blob/master/010-upload.Rmd)), and **knitr** will automatically determine the output filename to be `knitr-upload.md`.
I used the code below to make sure **knitr** will upload images and set some global chunk options.
```{r setup}
library(knitr)
opts_knit$set(upload.fun = imgur_upload, base.url = NULL) # upload all images to imgur.com
opts_chunk$set(fig.width=5, fig.height=5, cache=TRUE)
````
Now we write some code chunks in this markdown file:
```{r}
## a simple calculator
1+1
## boring random numbers
set.seed(123)
rnorm(5)
```
We can also produce plots which are uploaded to imgur.com:
```{r md-cars, message=FALSE}
par(mar = c(4, 4, .1, .1))
plot(mpg~hp, data=mtcars, pch=19)
par(mar = c(3, 2, .1, .1))
matplot(t(scale(mtcars)), lty=1, type='l', xaxt='n', ylab='')
axis(1, seq(ncol(mtcars)), colnames(mtcars))
```
So **knitr** is ready with GitHub with a single markdown file.
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