2446 search results for "GIS"

Running an R-based ABM in parallel on a Multicore Desktop

May 6, 2011
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I've been running for the last couple of months a lot of simulations written in R on legion cluster  here at UCL. But I still do many things on our quad-core server here at the institute, and parallelising the simulations is extremely handy.S...

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Extracting reflectance data from SpectraSuite JCAMP files in R

May 6, 2011
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Extracting reflectance data from SpectraSuite JCAMP files in R

I've been using an OceanOptics USB4000 spectrometer in research on biomass accumulation and climate in South Africa.This post presents a R function that will read in JCAMP files from the SpectraSuite software and output a vector of reflectance values.&...

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Extracting reflectance data from SpectraSuite JCAMP files in R

May 6, 2011
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Extracting reflectance data from SpectraSuite JCAMP files in R

I've been using an OceanOptics USB4000 spectrometer in research on biomass accumulation and climate in South Africa. This post presents a R function that will read in JCAMP files from the SpectraSuite software and output a vector of reflectance values.  SpectraSuite can convert binary output files to JCAMP files if they weren't saved as JCAMP. You...

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Who will be the next President of the US ?

May 5, 2011
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Who will be the next President of the US ?

A lot of weird facts (?) can be found on the internet. For instance, about the height of the winner of Presidential elections in the US: the taller always win... "Still, being short does, on average, hurt a person's prospects...The tall guy gets th...

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Whassup with glm()?

May 4, 2011
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We're having problem with starting values in glm(). A very simple logistic regression with just an intercept with a very simple starting value (beta=5) blows up....

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bigkmeans also works well for ordinary matrix objects: The biganalytics package

May 4, 2011
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bigkmeans also works well for ordinary matrix objects: The biganalytics package

The bigmemory is an excellent package for handling big matrix in R. There are several sister packages provided by "The Bigmemory Project": biganalytics for analysis, bigtabulate for tabulation, bigalgebra for linear algebra functionality, synchronicity...

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bigkmeans also works well for ordinary matrix objects: The biganalytics package

May 4, 2011
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bigkmeans also works well for ordinary matrix objects: The biganalytics package

The bigmemory is an excellent package for handling big matrix in R. There are several sister packages provided by "The Bigmemory Project": biganalytics for analysis, bigtabulate for tabulation, bigalgebra for linear algebra functionality, synchronicity for synchronization via mutexes and interprocess communication and message passing.biganalytics provides a few functions for analysis: linear regression model, generalized linear regression model, and...

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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

May 3, 2011
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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

I recently discovered the mtable() command in the memisc library and its use with toLatex() to produce nice summary output for lm and glm objects in a nicely formatted table like this:Once you have your linear model objects, all you need is one command...

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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

May 3, 2011
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Putting Robust Standard Errors into LaTeX Tables: An Extension of mtable

I recently discovered the mtable() command in the memisc library and its use with toLatex() to produce nice summary output for lm and glm objects in a nicely formatted table like this:Once you have your linear model objects, all you need is one command...

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Treebase trees from R

May 3, 2011
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Treebase trees from R

Treebase is a great resource for phylogenetic trees, and has a nice interface for searching for certain types of trees. However, if you want to simply download a lot of trees for analyses (like that in Davies et al.), then you want to be able to access...

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