remove extra period: .

linked-views.Rmd

@@ -18,7 +18,7 @@ knitr::include_graphics("images/plotlyEvents.gif")
 
 ### Updating views
 
-Obtaining data from a plotly event is easy, but updating view(s) based on the result of an event can be difficult. To start with something fairly easy, consider two scatterplots showing the same observations, but on different axes (i.e.., a subset of a scatterplot matrix). Figure \@ref(fig:plotlyLinkedBrushEasy) shows a linked lasso brush between two scatterplots. The main idea is that we first plot all the observations in black, then highlight the selection by adding an additional layer of selected points in red using the data returned by `event_data()`. In order to guarantee that we can uniquely identify observations in the event data, it is also crucial that we attach a `key` attribute to each observation (here the rownames of the data), which we can then use to filter the original data down to the selected observations. 
+Obtaining data from a plotly event is easy, but updating view(s) based on the result of an event can be difficult. To start with something fairly easy, consider two scatterplots showing the same observations, but on different axes (i.e., a subset of a scatterplot matrix). Figure \@ref(fig:plotlyLinkedBrushEasy) shows a linked lasso brush between two scatterplots. The main idea is that we first plot all the observations in black, then highlight the selection by adding an additional layer of selected points in red using the data returned by `event_data()`. In order to guarantee that we can uniquely identify observations in the event data, it is also crucial that we attach a `key` attribute to each observation (here the rownames of the data), which we can then use to filter the original data down to the selected observations. 
 
 Figure \@ref(fig:plotlyLinkedBrushEasy) consciously updates the source of the selection (the top plot) to match the visual characteristics of the target (the bottom plot). In general, whenever linking views to display graphical selection(s), matching the visual characteristics of the selection both the source and target(s) can aide interpretation, especially when using interactive graphics to present results to others. Although the update rule in Figure \@ref(fig:plotlyLinkedBrushEasy) is to simply layer on additional points, a full redraw is performed during the update, which can impact performance when dealing with a large amount of graphical elements.