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# Testing text output
See if chunk options like `tidy`, `prompt` and `echo`, etc work as expected.
## A normal chunk
```{r demo}
1+1
for (i in 1:10) {
# nothing before 10
if(i>=10)print(i)
}
# two blank lines below
dnorm(0)
```
## Do not evaluate
```{r demo, eval=FALSE}
```
## Add prompts
```{r demo, prompt=TRUE}
```
## No evaluate or tidy
```{r demo, eval=FALSE, tidy=FALSE}
```
## Do not tidy
```{r demo, tidy=FALSE}
```
## Do not echo
```{r demo, echo=FALSE}
```
## Do not comment out results
```{r demo, comment=NA}
```
## Do not echo the 2nd expression
```{r demo, echo=-2}
```
## Do not evaluate, echo the 2nd expression
```{r demo, eval=FALSE, echo=2}
```
## Only evaluate the first two expressions
```{r demo, eval=1:2}
```
## Add prompts but no tidy
```{r demo, tidy=FALSE, prompt=TRUE}
```
## Prompts, no evaluate or tidy
```{r demo, eval=FALSE, tidy=FALSE, prompt=TRUE}
```
## Change prompts
```{r}
options(prompt='R> ', continue='+ ')
```
```{r demo, prompt=TRUE}
```
## Backslashes
```{r}
{
# can you deal with \code{foo} or \n, \a?
gsub('\\.', '\\\\', 'a.b.c') # \link{bar}
}
cat('a\tb\nc')
```
## Other formatR options
We can set **formatR** options globally:
```{r}
options(formatR.blank = FALSE)
```
```{r demo, eval=FALSE}
```
Or locally in one chunk via `tidy.opts`. Do not keep comments:
```{r demo, eval=FALSE, tidy.opts=list(comment=FALSE)}
```
Move left braces to the next line:
```{r demo, eval=2, echo=2, tidy.opts=list(brace.newline=TRUE)}
```
Indent by 2 spaces:
```{r demo, eval=FALSE, tidy.opts=list(indent=2)}
```
See <http://yihui.org/formatR> for details.
## Empty chunks
```{r}
```
## Messages
Do not include messages:
```{r message=FALSE}
1+1
message('helloooo!')
```
No warnings:
```{r test-w, warning=FALSE}
1:2+1:3
warning('no no no')
```
Select warnings using numeric indices:
```{r test-w, warning=-1}
```
Invalid indices will select nothing:
```{r test-w, warning=3}
```
## The results option
Do not show text results:
```{r demo, results='hide'}
```
Flush all results to the end of a chunk:
```{r demo, results='hold'}
```
Output as is:
```{r results='asis'}
cat('_Markdown_,', 'oh yeah, **Markdown**')
```