Instantly share code, notes, and snippets.

# George Lesicaglesica

• Sort options
Created Jan 31, 2014
Minimal KNN implementation in Julia.
View knn.jl
 using StatsBase function knn(k, train, classes, obs) nearest = sortperm(vec(sqrt(sum(broadcast((a, b) -> (a-b)^2, obs, train), 2))))[1:k] return mode(classes[nearest]) end
Created Feb 3, 2014
A simple KNN implementation in Julia that allows for a reasonable level of flexibility. Written to practice using Julia.
View knn.jl
 function knn_normalize{T}(D::Array{T, 2}, mx::Array{T, 1}, mn::Array{T, 1}) return mapslices(x -> (x - mn) ./ (mx - mn), D, 2) end function knn_normalize{T}(D::Array{T, 1}, mx::Array{T, 1}, mn::Array{T, 1}) return (D - mn) ./ (mx - mn) end function knn_maxmin{T}(D::Array{T, 2}) mx = vec(mapslices(maximum, D, 1))
Last active Aug 29, 2015
Simulation demonstrating the characteristics of the Secretary Problem (https://en.wikipedia.org/wiki/Secretary_problem) using Julia (http://julialang.org/).
View secretary.jl
 # Do K simulation runs each with N items. The goal is to find the largest # item in the list, without "remembering" and carrying along some previous # maximum. N = 10000 K = 1000 diffs = zeros(Int, K) pct_diffs = zeros(Float64, K) for i = 1:K
Last active Aug 29, 2015
View cartesian_product.jl
 type Attr vals data end function cart_prod(sets...) result_size = length(sets) result_elems = reduce(*, 1, map(length, sets)) result = zeros(result_elems, result_size) scale_factor = result_elems
Last active Aug 29, 2015
View comprehension.jl
 julia> typeof([i for i = 1:nrow(ddf)]) Array{Any,1} julia> typeof([i for i = 1:10]) Array{Int64,1} julia> k = 10 10 julia> typeof([i for i = 1:k])
Created Dec 22, 2014
View pojos.java
 class RequestJson { protected String firstName; protected String lastName; // Getters and setters omitted } class ResponseJson extends RequestJson { protected Integer userId;
Created Jan 27, 2015
Hello, world! using a goroutine
View helloworld.go
 package main import ( "fmt" ) func main() { myChan := make(chan string) go func() { fmt.Println(<-myChan)
Created Jan 27, 2015
Simple example of a goroutine pool.
View pool.go
 package main import ( "fmt" "sync" ) func main() { numbers := make(chan int, 10) squares := make(chan int, 10)
Created Feb 14, 2015
View simple_pool.go
 package main import "sync" func main() { jobChan := make(chan int) resChan := make(chan int) squareGroup := new(sync.WaitGroup) // The workers
Created Mar 11, 2015
Brief exploration of Python's magic methods for equality testing.
View equality.py
 # Equality in Python # When using custom types (classes) many programmers like to be able # to use built-in concepts like "==" instead of something like # "a.equals(b)". Generally it is only a good idea to do this if the # concept you are implementing is conceptually the same as what the # operator is normally used for. An example: class Person1(object): def __init__(self, name, age):
You can’t perform that action at this time.