How can I make a consecutive animation of buttons?

How do I make an animation using an animation package for several independent maps plotting by ggmap package to reflect distribution changes of points by hour?

• I have a .csv file of devices positions with columns "Date","time","lat","lon","radius", "position_method". I want to plot the points data on Google map and make animation to reflect points changes by hour. I used the powerful animation package ( http://cran.r-project.org/web/packages/animation/animation.pdf. ) and a demo (http://xccds1977.blogspot.fi/2012/06/ggmap.html). By the loop for( i in time) print(plotfunc(i) I got an  animation but it accumulated new points and old ones, so the points are  increasing as sum. It could not reflect the changes of distribution. Do you  know how to make the animation just show the points in each hour one by  one rather than accumulate them? The animation I got is like the gif in the demo from Kai Xiao, but it is not what I wish. Only what I need is just  making animation combining independent images.

• Answer:

  The subset df statement should be : df <- subset(all,byhours>=x-1 & byhour<= x)