baptiste

library(ggplot2)
set.seed(1221)

dat <- data.frame(x=rnorm(100), y=rnorm(100), type=rep(1:2, each=50))
p <- ggplot(dat) + geom_point(aes(x, y)) +
  facet_wrap(~type) + coord_fixed() +
  theme(plot.background = element_rect(fill='red'))

# inspired by
# egg::set_panel_size

TysonStanley

library(bench)      # assess speed and memory
library(data.table) # data.table for all of its stuff
library(dplyr)      # compare it to data.table
library(profmem)    # assess the process of R functions

set.seed(84322)

# Example Data
d <- data.table(
  grp = sample(c(1,2), size = 1e6, replace = TRUE) %>% factor,

jhollist

library(USAboundaries)
library(sf)
library(dplyr)
library(elevatr)
library(raster)

# Get map of lower 48 states
usa_l48 <- us_boundaries() %>%
  filter(state_abbr != "HI" & 
           state_abbr != "AK" &

dpseidel

Default ggplot2 aesthetics by geom.

geom	alpha	angle	colour	family	fill	fontface	height	hjust	lineheight	linetype	shape	size	stroke	vjust	weight	width	xmax	xmin	ymax	ymin
GeomAbline	NA		black							1		0.5
GeomAnnotationMap	NA		NA		grey20					1		0.5
GeomArea	NA		NA		grey20					1		0.5
GeomBar	NA		NA		grey35					1		0.

eliocamp

library(data.table)
library(ggplot2)
data(volcano)
volcano <- as.data.table(melt(volcano, varnames = c("x", "y"),
                              value.name = "h"))


volcano[, c("dx", "dy") := metR::Derivate(h ~ x + y)]  # from my package. It calculates directional derivatives. 
volcano[, angle := atan2(-dy, -dx)]

tskaggs

Convert MOV to GIF using FFmpeg and ImageMagick

I tried a few different techniques to make a GIF via command-line and the following gives me the best control of quality and size. Once you're all setup, you'll be pumping out GIFs in no time!

Preparation

Install FFmpeg

• $ brew install ffmpeg [all your options]
  • Example: $ brew install ffmpeg --with-fdk-aac --with-ffplay --with-freetype --with-frei0r --with-libass --with-libvo-aacenc --with-libvorbis --with-libvpx --with-opencore-amr --with-openjpeg --with-opus --with-rtmpdump --with-schroedinger --with-speex --with-theora --with-tools

Install ImageMagick

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:

ndarville

[Isolating Differences Between Files][paper]

Advantage over Other Algorithms

The diff output is more specific:

[I]f a whole block of text is moved, then all of it, rather than just the beginning and end, is detected as changed.

>The algorithm described here avoids these difficulties. It detects differences that correspond very closely to our intuitive notion of difference.