added an example code for AFM font handling in R
added Lagrange Multiplier lecture but still not complete.
add Scala language example codes
add Rmd about ordinary Kriging interpolation in R
add example code for google causal impact package ®
add example code about SGD(Stochastic Gradient Descent) in Python
add Google causal impact example code. it maybe a duplication.
add a example code to use Korean language in R plot
add a Rnw file about correlation analysis in R
add files about aggregation ways in R (for a lecture)
add a markdown file about cosine similarity (for blog)
add an example code about R expression, call, quote and something. (high level R)