1850 search results for "tutorial"

Scheduling R Tasks with Crontabs to Conserve Memory

September 3, 2013
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Scheduling R Tasks with Crontabs to Conserve Memory

One of R’s biggest pitfalls is that eats up memory without letting it go.  This can be a huge problem if you are running really big jobs, have a lot of tasks  to run, or there are multiple users on your local computer or r server.  When I run huge jobs on my mac, I

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Sentiment Analysis on Twitter with Viralheat API

September 2, 2013
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Sentiment Analysis on Twitter with Viralheat API

Hi there! Some time ago I published a post about doing a sentiment analysis on Twitter. I used two wordlists to do so; one with positive and one with negative words. For the first try of a sentiment analysis it is surely a good way to start but if you want to receive more accurate …

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Easy 3-Minute Guide to Making apply() Parallel over Distributed Grids and Clusters in R

September 1, 2013
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Easy 3-Minute Guide to Making apply() Parallel over Distributed Grids and Clusters in R

Last week I attended a workshop on how to run highly parallel distributed jobs on the Open Science Grid (osg). There I met Derek Weitzel who has made an excellent contribution to advancing R as a high performance computing language by developing BoscoR. BoscoR greatly facilitates the use of the already existing package “GridR” by The post Easy...

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Latent Variable Analysis with R: Getting Setup with lavaan

September 1, 2013
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Latent Variable Analysis with R: Getting Setup with lavaan

Getting Started with Structural Equation Modeling Part 1Getting Started with Structural Equation Modeling: Part 1 Introduction For the analyst familiar with linear regression fitting structural equation models can at first feel strange. In the R environment, fitting structural equation models involves learning new modeling syntax, new plotting...

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Making regex examples work for you!

August 30, 2013
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One of the most frequently used string recognition algorithms out there is regex and R implements regex.  However, users can often be frustrated with how despite taking examples verbatim from many sources such as stackoverflow they do not seem to ...

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R and Linear Algebra

August 29, 2013
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by Joseph Rickert I was recently looking through upcoming Coursera offerings and came across the course Coding the Matrix: Linear Algebra through Computer Science Applications taught by Philip Klein from Brown University. This looks like a fine course; but why use Python to teach linear algebra? I suppose this is a blind spot of mine: MATLAB I can see....

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OpenCPU 1.0 release!

August 27, 2013
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OpenCPU 1.0 release!

After more than 3 years of development, we release the first official version of the OpenCPU system. Based on feedback and experiences from the beta series, OpenCPU version 1.0 has been rewritten entirely from scratch. The result is simple and flexible API that is easier to understand yet more powerful than before. With the new...

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Using JavaScript visualization libraries with R

August 26, 2013
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This is a short tutorial on knitr/markdown and JS visualization packages googleVis and rCharts. With these packages you can create web pages with interactive visualizations just using R. This will require minimal or no knowledge of HTML ...

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OpenCPU 1.0 release!

August 26, 2013
By

After more than 3 years of development, we release the first official version of the OpenCPU system. Based on feedback and experiences from the beta series, OpenCPU version 1.0 has been rewritten entirely from scratch. The result is simple and flexible API that is easier to understand yet more powerful than before. With the new release also comes a new website and...

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Electronic lab notebook

August 20, 2013
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Electronic lab notebook

I was interested to read C. Titus Brown‘s recent post, “Is version control an electronic lab notebook?” I think version control is really important, and I think all computational scientists should have something equivalent to a lab notebook. But I think of version control as serving needs orthogonal to those served by a lab notebook.

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