## Getting help

You have run into a problem and are looking for help about a function or specific topic.

**Solution:**
The `help`

function returns documentation about a
function or data frame.

The `apropos`

function lists command names that
contain a specific search pattern.

`RSiteSearch`

performs a search of the help pages,
the R-help mailing list archives and available vignettes.

Examples are shown below (not all output shown):

```
> help(mean) # Get help about the function mean
> help("mean") # Same as above
> ?mean # Same as above
> apropos("mean")
[1] "colMeans" "kmeans" "mean"
[4] "mean.data.frame" "mean.Date" "mean.default"
[7] "mean.difftime" "mean.POSIXct" "mean.POSIXlt"
[10] "rowMeans" "weighted.mean"
> help.search("mean")
Help files with alias or concept or title matching
`mean' using regular expression matching:
gplots::bandplot Plot x-y Points with Locally Smoothed
Mean and Standard Deviation
gplots::plotmeans
Plot Group Means and Confidence
Intervals
> RSiteSearch("sas2r") # Search for the string sas2r in online
> # help manuals and archived mailing lists
```

See rule 5.1 in *The R Primer* for more information

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