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Monthly Archives: March 2009

R tips: Swapping columns in a matrix

March 31, 2009
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R tips: Swapping columns in a matrix

Swapping two columns in a matrix is really easy: m

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Enhanced tidy.source() (Preserve Some Comments)

March 31, 2009
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After a few hours’ work, I modified the function tidy.source() in the animation package so that it can preserve complete comment lines. See the tidy.source() wiki page for example. tidy.source

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Multiple plot in a single image using ImageMagick

March 31, 2009
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Multiple plot in a single image using ImageMagick

Sometimes you need to add several plots/images either by row or by column to a single page/sheet.If you generate all your plot with R base graphics you can easily accomplished the task using the par() function, e.g., using par(mfrow=c(2,2)) and then dr...

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How accurate or reliable are R calculations?

March 28, 2009
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How accurate or reliable are R calculations?

On the REvolutions Blog there is a nice posting treating the often raised concern on “How good or reliable R is”. At my university R is hardly used. Sometimes I was asked by lecturers wether the calculations done by R and its packages are accurate. The linked posting treats this matter and tries to clarify

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R: Zip fastener for two data frames / combining rows or columns of two dataframes in an alternating manner

March 27, 2009
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R: Zip fastener for two data frames / combining rows or columns of two dataframes in an alternating manner

Sometimes I find it useful to merge two data frames like the following ones ? X1 X2 X3 X4 Y1 Y2 Y3 Y4 1? o? o? o? o X X X X 2? o? o? o? o X X X X 3? o? o? o? o X X X X by using zip feeding either

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R tips: Eliminating the “save workspace image” prompt on exit

March 26, 2009
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R tips: Eliminating the “save workspace image” prompt on exit

When using R, the statistical analysis and computing platform, I find it really annoying that it always prompts to save the workspace when I exit. This is how I turn it off.

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R tips: Keep your packages up-to-date

March 25, 2009
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R tips: Keep your packages up-to-date

In this entry in a small series of tips for the use of the R statistical analysis and computing tool, we look at how to keep your addon packages up-to-date.

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Alternative implementations using ggplot2

March 25, 2009
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Alternative implementations using ggplot2

Here and here, you can find alternative implementations of two plots? (1, 2) I created time ago using R basic graphic. The author recreates the plots taking advantage of the excellent ggplot2 package.

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Comparison of different circle graphs

March 24, 2009
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See in my Picasa here and get corrplot package here. Thanks Bob O'Hara's advice:)I found people's tastes differ, so input parameter col (fill color) and bg (background color) was added in new edition. What is more, now you can order your variables usin...

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Streaming Hadoop Data Into R Scripts

March 23, 2009
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Streaming Hadoop Data Into R Scripts

Along the lines of Mongo Measurement Requires Mongo Management, the HadoopStreaming package on CRAN provides utilities for applying R scripts to Hadoop streaming. Hadoop is used on Amazon's EC2.

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