Technical Tidbits From Spatial Analysis & Data Science

Menu

Skip to content
  • Home
  • Intro R workshop
  • Spatial R workshop
  • Machine Learning R workshop
  • Home
  • Data Solutions
  • Training
  • Research
  • About Us
  • Tech Blog
  • Contact us

Month: July 2015

Overlap joins in R: a speed comparison with packages sqldf and data.table

Posted on July 9, 2015 by zev@zevross.com · 4 Comments

In a perfect data world the tables you need to join have common IDs. In this setting, in R, you might use the merge function from the base package or the speedy and useful join functions from the dplyr package. But sometimes your join is a little more complicated. Say, for example, that you have […]

Continue reading →

We can help!

We specialize in data analytics, interactive maps, data visualization and Shiny applications.

Learn more about us

Search blog posts

Subscribe to new posts by email

Follow us on twitter

Follow @zevross
My Tweets

Categories

  • D3
  • Data Visualization
  • Database
  • GDAL
  • ggplot2
  • GIS/Maps
  • Graphic Design
  • JavaScript
  • LeafletJS
  • Markdown
  • PostGIS
  • PostgreSQL
  • Python
  • R
  • Regular Expressions
  • Shiny
  • Spatial
  • Uncategorized
  • Web Development
  • Web Mapping

Recent Comments

  • run3.pro on Easy multi-panel plots in R using facet_wrap() and facet_grid() from ggplot2
  • GS on Predictive modeling and machine learning in R with the caret package
  • Rodrigo on Using the R function anti_join to find unmatched records
  • Dev on Mapping in R using the ggplot2 package
  • fio on Map and analyze raster data in R
© 2025 Technical Tidbits From Spatial Analysis & Data Science
Powered by WordPress & Themegraphy
ZevRoss Spatial
Analysis
209 N. Aurora St, 2nd Floor
Ithaca, NY 14850
607-277-0004

info@zevross.com