hadley

# What's the most natural way to express this code in base R?
library(dplyr, warn.conflicts = FALSE)
mtcars %>%
  group_by(cyl) %>%
  summarise(mean = mean(disp), n = n())
#> # A tibble: 3 x 3
#>     cyl  mean     n
#>   <dbl> <dbl> <int>
#> 1     4  105.    11
#> 2     6  183.     7

dmcd

<script>
  import Vue from 'vue'
  const ol = Vue.ol

  const methods = {
    createMap () {
      map = new ol.Map({
        target: 'map',
        interactions: interactions,
        loadTilesWhileInteracting: true,

giannisp

After automatically updating Postgres to 10.0 via Homebrew, the pg_ctl start command didn't work.
The error was "The data directory was initialized by PostgreSQL version 9.6, which is not compatible with this version 10.0."

Database files have to be updated before starting the server, here are the steps that had to be followed:

# need to have both 9.6.x and latest 10.0 installed, and keep 10.0 as default
brew unlink postgresql
brew install postgresql@9.6
brew unlink postgresql@9.6
brew link postgresql

adeekshith

# <type>: (If applied, this commit will...) <subject> (Max 50 char)
# |<----  Using a Maximum Of 50 Characters  ---->|


# Explain why this change is being made
# |<----   Try To Limit Each Line to a Maximum Of 72 Characters   ---->|

# Provide links or keys to any relevant tickets, articles or other resources
# Example: Github issue #23

joyrexus

An introduction to curl using GitHub's API.

Basics

Makes a basic GET request to the specifed URI

curl https://api.github.com/users/caspyin

Includes HTTP-Header information in the output

jescalan

"A beginning programmer writes her programs like an ant builds her hill, one piece at a time, without thought for the bigger structure. Her programs will be like loose sand. They may stand for a while, but growing too big they fall apart.

Realizing this problem, the programmer will start to spend a lot of time thinking about structure. Her programs will be rigidly structured, like rock sculptures. They are solid, but when they must change, violence must be done to them.

The master programmer knows when to apply structure and when to leave things in their simple form. Her programs are like clay, solid yet malleable."

-- Master Yuan-Ma, The Book of Programming

RCura

  output$downloadShp <- downloadHandler(
    filename = 'fbCrawlExport.zip',
    content = function(file) {
      if (length(Sys.glob("fbCrawl.*"))>0){
        file.remove(Sys.glob("fbCrawl.*"))
      }
      writeOGR(getGeoContent(), dsn="fbCrawl.shp", layer="fbCrawl", driver="ESRI Shapefile")
      write.csv(as.data.frame(cbind(getGeoContent()@data, as.data.frame(getGeoContent()@coords))), "fbCrawl.csv")
      zip(zipfile='fbCrawlExport.zip', files=Sys.glob("fbCrawl.*"))
      file.copy("fbCrawlExport.zip", file)

dergachev

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application: