Monthly Archives: May 2011

map.xyz(): interpolation of XYZ data and projection onto a map

May 30, 2011
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map.xyz(): interpolation of XYZ data and projection onto a map

     I am still struggling to get a grasp of R's mapping capabilities. Part of my frustration lies in the fact that I often work on areas near the poles, which complicates interpolation across the 180 degree line. For smaller areas, interpolati...

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Legendre & Borcard: Nested ANOVA by Permutation

May 30, 2011
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Legendre & Borcard: Nested ANOVA by Permutation

..here's a very illustrative R-Script example by Legendre & Borcard showing how a Nested ANOVA can be done by permutation.Read more »

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Array position to matrix coordinates conversion

May 30, 2011
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Array position to matrix coordinates conversion

#A function that is sometimes useful in determining the #coordinate(i.e. row and column number) of a matrix position#(and vice-versa). #Either a vector of positions ("pos") #OR a 2 column matrix of matrix coordinates, ("coord", i.e. cbind(row,col)), #A...

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XLConnect 0.1-4

May 30, 2011
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XLConnect 0.1-4

Mirai Solutions GmbH (http://www.mirai-solutions.com) is pleased to release XLConnect 0.1-4. In the time since our first release (XLConnect 0.1-3, released on Feb 28, 2011) we received very positive and constructive feedback from the R community which heavily influenced the development … Continue reading →

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Searching for inaccurate literals in R

May 29, 2011
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Searching for inaccurate literals in R

In creating the numbers tool I wanted to be able to do two things, 1) obtain information about what source did by matching the numeric literals it contained against a database of ‘interesting’ values (now with over 14,000 entries) and 2) flag possible incorrect numeric literals (e.g., 3.1459265 when 3.14159265 had been intended in core/Helix.cpp

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R/Finance 2011 Presentations are online

May 29, 2011
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For those of you who don't subscribe to the R-SIG-Finance mailing list: You really should subscribe ;-) Dirk Eddelbuettel announced the R/Finance 2011 presentations are now available. I've included the entire announcement (with some hyperlinks) below.The organizing committee for the R/Finance 2011 conference is pleased to announce the availability of presentation slides from the 3rd annual R/Finance...

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googleVis-0.2.4 requires older version of RJSONIO (0.5-0) #rstats

May 29, 2011
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googleVis-0.2.4 requires older version of RJSONIO (0.5-0) #rstats

Downgrade to RJSONIO 0.5 if you want to be able to set initial states with the current googleVis package. Otherwise, there will be lots of extra backslashes in your JavaScript--and blank pages in your browser.

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Dicetributions – episode I

May 29, 2011
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Dicetributions – episode I

Suppose the following game with two players: In every round, the two players pick a random number, each. Instead of using a dice, they pick a number from an interval. Player A picks a number from and player B from . Variation 1. The greater number wins. Who is more likely to win? It

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R functions for Earth geographic coordinate calculations

May 29, 2011
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R functions for Earth geographic coordinate calculations

Here are some functions that I regularly use for geographic data (e.g. binning, filtering, calculation of new positions etc.).#distance in kilometers between two long/lat positions (from "fossil" package)earth.dist <- function (long1, lat1, long2, l...

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Which R documents to read, and which R packages to use

May 29, 2011
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Which R documents to read, and which R packages to use

There are lots of R documents and over 3000 R packages. Which documents to start with and which R packages to use are questions faced by many people. If you are new to R, an Introduction to R can be … Continue reading →

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