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xiaodaigh / feeatherc.r
Created August 28, 2017 22:47
Some R to read .feather data chunkwise
# featherc
library(data.table)
library(feather)
library(future)
library(dplyr)
plan(multiprocess)
options(future.globals.maxSize = Inf)
split_feather <- function(feather_file, by = NULL, parts = parallel::detectCores()) {
system.time(inputdata <- feather::read_feather(feather_file))
@xiaodaigh
xiaodaigh / how_to_use_split_into_columns.sas
Last active August 25, 2017 05:22
A SAS macro to split a dataset (.sas7bdat) into datasets where each resultant dataset contains exactly one column of the original data
data a;
do i = 1 to 10000;
b = i;
output;
end;
run;
%include "path/to/split_into_columns.sas";
libname outlib "path/to/output/dataset/";
Top 5 Underdog Stories
1. Zhou Jun Xun wins LG cup
No one from outside Japan, South Korea, China has ever won an international title until Zhou Jun Xun from Taiwan. He was the first 9 dan from Taiwan and he has an unmistakable large red birth mark on his face. On his way to LG cup victory he defeated Lee Chang Ho and Lee Sedol. His most famous win was against Lee Sedol where he played a new move in the avanlanche
2. Ear-reddening
Shuwa was the up start who nobody expected could challenge the pre-Meijin
3. Go Seigen vs Shuko
When Go Seigen won the competition to ear the right to challenge Shuko. No one expected Go to win or perhaps come close to winning. Shuko played white and since there is no komi at the time, the only adavantage he had was that he could adjourn the game at any time. Go lost the game by 2 points.
@xiaodaigh
xiaodaigh / hd_binning
Created April 10, 2014 02:59
hd_binning
High Definition Binning {#HD_binning}
=====================
The process of binning (or discretization) of variables is a well-established practice in building credit scorecards. The binning process involves taking raw values e.g. income and cutting that data into bins (discrete ranges) such as 2000-3000, 3000-4000. Typically we would see an upward trend in terms of Good/Bad Odds as the income levels go up.
In this blog post I would like to explain a novel approach to binning that can produce very fine binning.
Automatic Binary Binning Algorithm (ABBA)
---------
@xiaodaigh
xiaodaigh / intro.r
Created January 22, 2014 12:26
Intro to R
# reading and writing files
# press ctrl+enter to send
iris
fix(iris)
write.csv(iris,"c:/temp/iris.csv")
iris2 = read.csv("c:/temp/iris.csv")
nrow(iris2)
# get help
@xiaodaigh
xiaodaigh / server.r
Created December 16, 2013 18:38
Shiny callback mechanism
#install.packages(c("devtools","svSockets")) # if not already installed
#devtools::install_github("gosocket","analytixware") # if not already installed
#devtools::install_github("shinysky","analytixware") # if not already installed
library(shiny)
library(shinysky)
library(gosocket)
# Define server logic required to generate and plot a random distribution
shinyServer(function(input, output,session) {
data <- read.csv("c:/bb2.csv")
cor.data <- cor(data[sapply(data,typeof)=="double"],method="spearman")
dist <- function(y,x) {
if(is.null(dim(x))) {
sqrt((x[1] - y[1])^2 + (x[2] - y[2])^2)
} else {
sqrt((x[,1] - y[1])^2 + (x[,2] - y[2])^2)
}
@xiaodaigh
xiaodaigh / server.r
Created October 25, 2013 22:02
R Shiny Password Input
library(shiny)
shinyServer(function(input, output, session) {
# Partial example
output$meh <- renderPrint({
print("Meh --- ")
print(input$myTextInput )
print(input$passInput )
})
@xiaodaigh
xiaodaigh / server.r
Last active February 2, 2016 18:07
R Shiny: An textInput that only gets invalidated upon losing focus or when enter is pressed shiny::runGist("7150112")
library(shiny)
shinyServer(function(input, output, session) {
# Partial example
output$meh <- renderPrint({
print("Press enter or focusout to update --- ")
print(input$myTextInput )
@xiaodaigh
xiaodaigh / README.md
Last active February 1, 2017 02:15
== actionButton styling == The Twitter Bootstrap allows for many class styles for buttons. http://getbootstrap.com/2.3.2/base-css.html#buttons Added support for these styles to the actionButton.