3575 search results for "gis"

Advanced Graphics I

June 22, 2013
By
Advanced Graphics I

Polygon is a such handy function in R for drawing beautiful charts where we can select regions (polygons) of the surface. It’s quite useful for indicating confidence regions of parameters, predictions for time-series, or areas under distributions:

Read more »

Calling C++ from R using Rcpp

June 22, 2013
By

Why call C/C++ from R? I really like programming in R. The fact that it is open source immediately wins my favour over Matlab. It can, however, be quite slow especially if you “speak” R with a strong C/C++ accent. This sluggishness, especially when writing unavoidable for loops, has led me to consider other programming The post Calling...

Read more »

Got Bootstrap?

June 22, 2013
By
Got Bootstrap?

This week I read the book by Michael Chernick and Robert LaBudde, An Introduction to Bootstrap Methods with Applications to R. It’s an interesting oeuvre for useRs of all stripes. I strongly recommend check it out. The book brings lots of examples of bootstrapping applications, such as standard errors, confidence intervals, hypothesis testing, and even bootstrap...

Read more »

Five years of Weight Tracking

June 22, 2013
By
Five years of Weight Tracking

After I moved back from New Jersey in June 2008 I started to track my body weight more seriously. My routine usually consists of getting up and after finishing the morning bathroom I would step on my scale. That way I try to ensure that the condition for each weighing are as similar as possible. … Continue reading...

Read more »

Not only CRAN downloads and Shiny … but also .. rCharts

June 21, 2013
By
Not only CRAN downloads and Shiny … but also .. rCharts

I have been meaning for some time to get stuck into the rCharts package which provides an interface to many Javascript graphic libraries. These offer rich charting capabilities with interactivity and a great deal of customization. As regular readers will know, I am also interested in improved publicity for CRAN packages, although the Shiny app

Read more »

Disposable Visual Data Explorers with Shiny – Guardian University Tables 2014

June 21, 2013
By
Disposable Visual Data Explorers with Shiny – Guardian University Tables 2014

Have data – now what? Building your own interactive data explorer need not be a chore with the R shiny library… Here’s a quick walkthrough… In Datagrabbing Commonly Formatted Sheets from a Google Spreadsheet – Guardian 2014 University Guide Data, I showed how to grab some data from several dozen commonly formatted sheets in a

Read more »

Upcoming Rcpp talk in Sydney

June 20, 2013
By

The Sydney Users of R Forum (SURF) will be hosting me for a talk on July 10. The focus will be Rcpp for R and C++ integration, and the intent is to have this be really applied with lots of motivating examples. Organizers Louise and Eugene were able...

Read more »

Quickly read Excel (xlsx) worksheets into R on any platform

June 20, 2013
By

I wrote a couple days about about importing Excel files into R. There are lots of ways to do this, but all the ways that use only R have drawbacks (as I outlined in my last post), and all the other ways require installation of programs other than R. I’m not opposed to using programs

Read more »

Huge interest in next LondonR user group meeting

June 20, 2013
By

The next LondonR meeting takes place on the 16 July and registrations have already exceeded 200. Presentations at the meeting will be made by Rich Pugh of Mango Solutions, Andrie de Vries of Revolution Analytics and Hadley Wickham of RStudio. All places for a  pre-meeting workshop with Hadley Wickham were snapped up within 2 days of announcing the details. More information...

Read more »

Spatial Overlays with R – Retrieving Polygon Attributes for a Set of Points

June 19, 2013
By

A short tutorial for spatial overlays using R-GIS..library(sp)library(dismo)# spatial dataalt gadm # viewplot(alt)plot(gadm, add=T)# some addressespts # make it spatialcoords spdf_pts # assign CRS/projectionproj4string(spdf_pts) # check datastr(spdf_pts)# plot it on topplot(spdf_pts, cex = 2, col = 2, add = T)# do an intersection (points in polygon)# yielding the polygon's attribute dataover(spdf_pts, gadm)

Read more »

Sponsors

Never miss an update!
Subscribe to R-bloggers to receive
e-mails with the latest R posts.
(You will not see this message again.)

Click here to close (This popup will not appear again)