2093 search results for "twitter"

R: Building functions – using default settings that can be modified via the dot-dot-dot / three point argument

April 7, 2009
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R: Building functions – using default settings that can be modified via the dot-dot-dot / three point argument

Before you read this post, please have a look at Enrique’s comment below. He pointed out that the built-in R function modifyList() already does what I wanted to describe in this post. Well, I live to learn :) I was wondering how I could write a function that uses default settings but accepts a list

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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: Monitoring the function progress with a progress bar

March 16, 2009
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R: Monitoring the function progress with a progress bar

Every once in while I have to write a function that contains a loop doing thousands or millions of calculations. To make sure that the function does not get stuck in an endless loop or just to fulfill the human need of control it is useful to monitor the progress. So  first I tried the

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Workflow with Python and R

March 6, 2009
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Workflow with Python and R

I seem to be doing more and more with Python for work over and above using it as a generic scripting language. R has been my workhorse for analysis for a long time (15+ years in various incarnations of S+ and R), but it still has some deficiencies. I’m finding Python easier and faster to

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What is R?

March 1, 2009
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What is R?

Highlights R is a free software environment for statistical computing and graphics. It compiles and runs on a wide variety of UNIX platforms, Windows and MacOS.   If you wish to download R, please choose your preferred CRAN mirror. Basic questions ...

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R’s working directory

October 3, 2008
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R’s working directory

Do you usually start R with a desktop icon or some other shortcut? Are you tired of using setwd and getwd each time after you start R to get the working directory correctly? If so, then your days of suffering might be just coming to an end. Having the working directory set correctly is very

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rgraph6 on R-Forge

September 4, 2008
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rgraph6 on R-Forge

I have moved my rgraph6 R package to R-Forge. R-Forge is a website that facilitates development of R packages by providing services for version control (through Subversion), automatic checking and building of the packages including binaries for Windows and MacOS, as well as for collaboration with other R users/developers. The rgraph6 package has been already

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UseR!2008 aftermath

August 30, 2008
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UseR!2008 aftermath

Earlier in August I was on the R user conference which this year took place in Dortmund. It was a quite an exciting event gathering around 500 people from around the globe and featuring 170 presentations and talks. Topics varied from new developments in the R system, newly implemented statistical methods as well as plethora

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Design Flaws in R #2 — Dropped Dimensions

August 19, 2008
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Design Flaws in R #2 — Dropped Dimensions

In a comment on my first post on design flaws in the R language, Longhai remarked that he has encountered problems as a result of R’s default behaviour of dropping a dimension of a matrix when you select only one row/column from that dimension. This was indeed the design flaw that I was going to

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