# Getting Help With Functions In R Programming

In our previous articles we described how to install and start using R/RStudio. We also provide the essentials of R programming.

**help**about a specific function in

**R**

# Getting help on a specific function

To read more about a given function, for example **mean**, the R function **help**() can be used as follow:

`help(mean)`

Or use this:

`?mean`

The output look like this:

If you want to see some examples of how to use the function, type this: **example**(function_name).

`example(mean)`

Note that, typical R help files contain the following sections:

**Title****Description**: a short description of what the function does.**Usage**: the syntax of the function.**Arguments**: the description of the arguments taken by the function.**Value**: the value returned by the function**Examples**: provide examples on how to use the function

# General help

If you want to read the general documentation about R, use the function **help.start**():

`help.start()`

The output is a web page, on most R installations, which can be browsed by clicking the hyperlinks.

# Others

**apropos**(): returns a list of object, containing the pattern you searched, by partial matching. This is useful when you don’t remember exactly the name of the function:

```
# Returns the list of object containing "med"
apropos("med")
```

```
[1] ".__C__namedList" "elNamed" "elNamed<-" "median" "median.default"
[6] "medpolish" "runmed"
```

**healp.search**() (alternatively**??**): Search for documentation matching a given character in different ways. It returns a list of function containing your searched term with a short description of the function.

```
help.search("mean")
# Or use this
??mean
```

# Infos

This analysis has been performed using **R software** (ver. 3.2.3).

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