Monthly Archives: July 2011

Another way to use R in Excel for .NET programmer

July 5, 2011
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Another way to use R in Excel for .NET programmer

As you know, RExcel give us a way to combine R with Excel.But, It just bothering to install some COMs and maybe not be programming but excel manipulation!If you are a .NET programmer, there is another way to call R from Excel.I would like to ...

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Different goals, different looks: Infovis and the Chris Rock effect

July 5, 2011
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Different goals, different looks:  Infovis and the Chris Rock effect

Seth writes: Here’s my candidate for bad graphic of the year: I studied it and learned nothing. I have no idea how they assigned colors to locations. I already knew that there were more within-city calls than calls to individual distant locations — for example that there are more SF-SF calls than SF-LA calls.

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In 4 Steps your Application (including R) is running on a Cloud Computing Cluster

In 4 Steps your Application (including R) is running on a Cloud Computing Cluster

Today, cloud computing is used in many application areas from academic research to industry. Commercial cloud providers as Amazon Web Services (AWS) advertise the simple and fast access to cloud computing resources. Posts in different blogs proof that you can get your application running in the cloud, but it will cost you more than 15

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Bounded target support

July 4, 2011
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Bounded target support

Here is an interesting question from Tomàs that echoes a lot of related emails: I’m turning to you for advice. I’m facing problem  where parameter space is bounded, e.g. all parameters have to be positive. If in MCMC as proposal distribution I use normal distribution, then at some iterations I get negative proposals. So my

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slides from my R tutorial on Twitter text mining #rstats

July 4, 2011
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slides from my R tutorial on Twitter text mining #rstats

Update: An expanded version of this tutorial will appear in the new Elsevier book Practical Text Mining and Statistical Analysis for Non-structured Text Data Applications by Gary Miner et. al which is now available for pre-order from Amazon. In conjunction with the book, I have cleaned up the tutorial code and published it on github.

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R.NET

July 4, 2011
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The R.NET project provides a mechanism for communicating with R from a .NET application. This appears to be a promising way to create simple interfaces to some of the functionality of R. Some examples of using R.NET can be found here and here.

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Contributions to the R Project

July 4, 2011
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The R Project would not exist without the contributions of the R Core Group, the 21 volunteer statisticians and computer scientists from around the world who have donated their time and expertise to create the R langauge, its core packages, and manage its regular release and binary distribution process via the CRAN network. Many Core Group members also tirelessly...

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Questions about quantum computing

July 4, 2011
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I read this article by Rivka Galchen on quantum computing. Much of the article was about an eccentric scientist in his fifties named David Deutch. I’m sure the guy is brilliant but I wasn’t particularly interested in his not particularly interesting life story (apparently he’s thin and lives in Oxford). There was a brief description

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Reverse Iteration

July 3, 2011
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Reverse Iteration

Time to horrify some people.First let's include the code we wrote last time,> source("pretend.R")and the dependency-tracking environment it creates will be used to run all the following examples.Let's look at, I don't know, I'm just trying to demonstrate a language feature so uh... band-pass filtering Gaussian noise.Here's some noise:

Testing for valid variable names

July 3, 2011
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Testing for valid variable names

I have something a fondness for ridiculous variable names, so it’s useful to be able to check whether my latest concoction is legitimate. More so if it is automatically generated. Not having an is_valid_variable_name function is one of those odd omissions from R, and the assign function doesn’t check validity. To recap, there are a

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