Monthly Archives: October 2009

From ORD Sessions to R-Forge in 12 hours with RProtoBuf

October 22, 2009
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Yesterday, via in invitation from fellow Chicago-area Google Summer of Code mentor Borja Sotomayor, I attended the Second ORD Sessions. These are happening at the HQ of Inventable where a couple of technologists and Open Source geeks from the Chicagoland area get together and riff on code for a few hours after work over some pizza and beer. Sounded good, and I...

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ISO week

October 22, 2009
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I am working with a model that produces estimates of snow water equivalent through time. Because I deal with large spatial extents, I decided to have the model produce weekly averages. The problem with this is knowing which file to access for a given d...

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ISO week

October 22, 2009
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I am working with a model that produces estimates of snow water equivalent through time. Because I deal with large spatial extents, I decided to have the model produce weekly averages. The problem with this is knowing which file to access for a given d...

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Leap years

October 22, 2009
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A quick function that when provided a numeric vector of years returns a boolean vector where TRUE == Leap year.is.leapyear=function(year){ #http://en.wikipedia.org/wiki/Leap_year return(((year %% 4 == 0) & (year %% 100 != 0)) | (year %% 400 == 0))}

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Leap years

October 22, 2009
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A quick function that when provided a numeric vector of years returns a boolean vector where TRUE == Leap year.is.leapyear=function(year){ #http://en.wikipedia.org/wiki/Leap_year return(((year %% 4 == 0) & (year %% 100 != 0)) | (year %% 400 == 0))}

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Aggreate electoral targeting with R

October 22, 2009
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Aggreate electoral targeting with R

Aggregate electoral targeting is the process of determining the likely hood of a citizen choosing to vote turnout), and which candidate that person is most likely to vote for (partisan bias) in a given race using historical turnout and partisan bias. The output from this targeting allows a campaign to project the likely number of voters, what percentages their...

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ggplot2: Two Color XY-Area Combo Chart

October 21, 2009
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ggplot2: Two Color XY-Area Combo Chart

David@Work blog shows how to fill in the area between two crossing lines in an Excel chart. This post was also published as a guest-post on PTS blog. Let’s try to replicate this graph in ggplot2. First, load ggplot2 and generate the data frame to be used in the example (I am using a slightly

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InferenceR looks interesting

October 21, 2009
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InferenceR looks interesting

I obtained a free academic copy of the InferenceR, which is a R IDE for Windows. I has several interesting features such as a visual debugger. It is definitely worth some further exploration. Of course, the problem (and the only problem for now) is tha...

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[, [[, $: R accessors explained

October 21, 2009
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[, [[, $: R accessors explained

For more than ten years, I have been teaching R both formally and informally. One thing that I find often trips up students is the use of R’s accessors and mutators. ( For those readers not from a formal computer science background, an accessor is a method for accessing data in an object

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Lots of maps using R

October 21, 2009
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Lots of maps using R

http://r-spatial.sourceforge.net/gallery/#fig01.RVery helpful!

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