1198 search results for "maps"

Subjective Ways of Cutting a Continuous Variables

December 2, 2014
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Subjective Ways of Cutting a Continuous Variables

You have probably seen @coulmont's maps. If you haven't, you should probably go and spend some time on his blog (but please, come back afterwards, I still my story to tell you). Consider for instance the maps we obtained for a post published in Monkey Cage, a few months ago, The codes were discussed on a blog post (I...

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Ants, snakes, and the hydrophobic-polar model

December 1, 2014
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Ants, snakes, and the hydrophobic-polar model

The other night I was reading Lesk’s Introduction to Protein Science, when I came across this diagram: A lattice model represents the structure of a protein as a connected set of points distributed at discrete and regular positions in space, with simplified interaction rules for calculating the energies of different conformations. For small lattice polymers, it is...

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R, an Integrated Statistical Programming Environment and GIS

November 27, 2014
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R, an Integrated Statistical Programming Environment and GIS

This article was originally published in Geoinformatics magazine. R is well known as a powerful, extensible and relatively fast statistical programming language and open software project with a command line interface (CLI). What is less well known is that R also has cutting edge spatial packages that allow it to behave as a fully featured Geographical Information System...

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Power Outage Impact Choropleths In 5 Steps in R (featuring rvest & RStudio “Projects”)

November 27, 2014
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Power Outage Impact Choropleths In 5 Steps in R (featuring rvest & RStudio “Projects”)

I and @awpiii were trading news about the power outages in Maine & New Hampshire last night and he tweeted the link to the @PSNH Outage Map. As if the Bing Maps tiles weren’t bad enough, the use of a categorical color scale instead of a sequential one caused sufficient angst that I whipped up

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Trading The Odds Volatility Risk Premium: Addressing Data Mining and Curve-Fitting

November 19, 2014
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Trading The Odds Volatility Risk Premium: Addressing Data Mining and Curve-Fitting

Several readers, upon seeing the risk and return ratio along with other statistics in the previous post stated that the … Continue reading →

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Moving The Earth (well, Alaska & Hawaii) With R

November 16, 2014
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Moving The Earth (well, Alaska & Hawaii) With R

In a previous post we looked at how to use D3 TopoJSON files with R and make some very D3-esque maps. I mentioned that one thing missing was moving Alaska & Hawaii a bit closer to the continental United States and this post shows you how to do that. The D3 folks have it easy.

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Applying A Divergent Color Scale to A Gene Expression Heat Map

November 14, 2014
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Applying A Divergent Color Scale to A Gene Expression Heat Map

Estimated Read Time: Under 5 minutes This is a quick post about a quick little experiment I tried lately. I saw a recent post about how red and blue color scales on political heat maps can be misleading--primarily because human perception is not very good at discriminating between shades of purple in the presented scenario. Since gene expression heat...

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Basic mapping and attribute joins in R

November 9, 2014
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Basic mapping and attribute joins in R

This post is based on the free and open source Creating-maps-in-R teaching resource for introducing R as a command-line GIS. R is well known as an language ideally suited for data processing, statistics and modelling. R has a number of spatial packages, allowing analyses that would require hundreds of lines of code in other languages to be implemented with...

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solar navigation

November 9, 2014
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solar navigation

Introduction Solar altitude is a function of time, longitude and latitude, and so it can be possible to infer location based on measuring altitude as a function of time. This form of solar navigation can be based on sunrise and sunset times, at least on non-equinox days. I have explored this for a school-based project I call “SkyView” involving light sensors and Arduino microcontrollers,...

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Improving R Data Visualisations Through Design

November 6, 2014
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Improving R Data Visualisations Through Design

When I start an R class, one of my opening lines is nea

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