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Shunichi Otsuka vascoosx

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@vascoosx
vascoosx / Gemfile
Created October 22, 2019 11:10
Nim/Ruby FFI
# frozen_string_literal: true
source 'https://rubygems.org'
gem 'ffi'
@vascoosx
vascoosx / optimal_change.rb
Last active August 15, 2019 02:48
coin change problem solver in ruby
# code modified from https://github.com/nelsonic/coin-change-ruby
class Change
def change(amount, available_coins = [100, 50, 25, 10, 5, 1])
@available_coins = available_coins
smallest = @available_coins.min
zeros = [0] * @available_coins.size
solutions = (0...@available_coins.size).map { |n| k = zeros.dup; k[n] = 1; k }
vectors = solutions.dup
visited = Hash[solutions.map { |v| [v, true] }]
@vascoosx
vascoosx / docker-compose.yml
Last active July 1, 2019 09:52
docker compose
version: '3'
services:
db:
image: postgres:10.4-alpine
ports:
- 5432:5432
volumes:
- postgres:/var/lib/postgresql/data
redis:
image: redis:4.0-alpine
@vascoosx
vascoosx / AddressStore.sol
Created August 29, 2018 14:55
pragma solidity ^0.4.11;
contract AddressStore {
address[] public bought;
address public selected;
function sb(uint256 _index) public returns (address){
uint256 i = _index;
selected = bought[i];
return selected;
@vascoosx
vascoosx / .bash_profile
Last active October 11, 2019 01:52
eval "$(rbenv init -)"
export EDITOR=vim
LOG_COMMAND='if [ "$(id -u)" -ne 0 ]; then echo "$(date "+%Y-%m-%d.%H:%M:%S") $(pwd) $(history 1)" >> ~/.logs/bash-history-$(date "+%Y-%m-%d").log; fi'
if [ -z "${PROMPT_COMMAND}" ]; then
export PROMPT_COMMAND=${LOG_COMMAND}
else
export PROMPT_COMMAND="${PROMPT_COMMAND}; ${LOG_COMMAND}"
fi
export CLICOLOR=1
@vascoosx
vascoosx / readParquet.R
Created November 13, 2017 10:30
sparkR setup
Sys.setenv('SPARKR_SUBMIT_ARGS'='"--packages" "com.databricks:spark-csv_2.11:1.2.0" "sparkr-shell"')
library(SparkR, lib.loc = "/home/user1/programs/spark-2.2.0-bin-hadoop2.7/R/lib/")
sc <- sparkR.session(master = "local", appName="myapp", sparkHome = "/home/ubuntu/programs/spark-2.2.0-bin-hadoop2.7",
sparkConfig=list(spark.executor.memory="6g", spark.driver.memory="12g"))
df <- collect(read.parquet("big/parquet/file1"))
sparkR.stop()
@vascoosx
vascoosx / Dockerfile
Last active November 6, 2017 05:24
kubernetes dask cluster
FROM continuumio/miniconda3
ENTRYPOINT [ "/bin/bash", "-c" ]
ADD . /deps
WORKDIR /deps
RUN conda install --yes --file req.txt
CMD ["source activate dask && dask-scheduler"]
@vascoosx
vascoosx / core-site.xml
Last active September 26, 2017 06:33
Apache Drill + R intro
<configuration>
<property>
<name>fs.s3a.access.key</name>
<value>ACCESSKEY</value>
</property>
<property>
<name>fs.s3a.secret.key</name>
<value>SecretKey</value>
@vascoosx
vascoosx / use_index.R
Last active September 7, 2017 06:02
data.table optimization tip
library(rbenchmark)
library(data.table)
n <- 100000
f <- sample(c("a","b","c"),n, replace=TRUE)
a <- data.table(a=runif(n,0,100),b=runif(n,0,100),f=f)
setindex(a,"a")
setindex(a,"b")
setindex(a,"f")
op = options(datatable.verbose=FALSE)
@vascoosx
vascoosx / add_facts.yml
Last active January 5, 2017 16:11
incrementally add facts
---
- hosts: all
connection: local
tasks:
- name: check
local_action: debug msg={{ item.name }}
with_items:
- "{{ files }}"
- name: register data