#### Overview of this book

R Graph Essentials
Credits
www.PacktPub.com
Preface
Free Chapter
Base Graphics in R – One Step at a Time
Creating Graphs with ggplot
Index

## Creating histograms with qplot

Now, let's learn how to create a histogram using `geom = "histogram"` and control the bin width using the argument `binwidth`. In this example, we will create a histogram of the heights of the patients and select a bin width of 10 cm. The syntax is as follows:

```qplot(HEIGHT, geom = "histogram",  ylab = "COUNT", xlab = "HEIGHT", binwidth = 10)
```

Here is our histogram:

Our histogram has a rather chunky appearance, and we may wish to change the color and other attributes of the default histogram. By the way, note what happens if we use the syntax `color = I("blue")`:

```qplot(HEIGHT, geom = "histogram",  ylab = "COUNT", xlab = "HEIGHT", binwidth = 10, color = I("blue"), fill = I("wheat"))
```

Now the histogram looks like this:

We get blue outlines for the bars and the axes. Remember that, for histograms, the `color` argument controls the color of the histogram outlines, while the argument `fill` controls the color of the bars.