## Animations generated in R version 3.2.3 (2015-12-10)
##   using the package animation
library(animation)
library(knitr)
grad.desc(col.contour = 1, col.arrow = 2)
## R version 3.2.3 (2015-12-10)
## Platform: x86_64-w64-mingw32/x64 (64-bit)
## Other packages: animation 2.4, knitr 1.11