月度档案:March 2009

R tips: Swapping columns in a matrix

3月31日,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)

3月31日,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

3月31日,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,例如。,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".在我的大学里,R几乎不用。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

3月26日,2009
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R tips: Eliminating the "save workspace image" prompt on exit

When using R,统计分析计算平台,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,我们将研究如何使您的插件包保持最新。

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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.作者利用优秀的ggplot2软件包重新创建了这些情节。

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Comparison of different circle graphs

3月24日,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

3月23日,2009
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Streaming Hadoop Data Into R Scripts

Along the lines of Mongo Measurement Requires Mongo Management,cran上的hadoop streaming包提供了将r脚本应用于hadoop流的实用程序。Hadoop用于亚马逊的EC2。

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