3904 search results for "GIS"

Row Search in Parallel

September 28, 2014
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Row Search in Parallel

I’ve been always wondering whether the efficiency of row search can be improved if the whole data.frame is splitted into chunks and then the row search is conducted within each chunk in parallel. In the R code below, a comparison is done between the standard row search and the parallel row search with the FOREACH

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Deep Down Below – Using in-database analytics from within Tableau (with MADlib)

September 28, 2014
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Deep Down Below – Using in-database analytics from within Tableau (with MADlib)

Introduction Using Tableau for visualizing all kinds of data is quite a joy, but it’s not that strong on build-in analytics or predictive features. Tableaus integration of R was a huge step in the right direction (and I love it very much - see here, here and here) but still has some limitations (e.g. no RAWSQL...

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A bioinformatics walk-through: Accessing protein-protein interaction interfaces for all known protein structures with PDBe PISA

September 28, 2014
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A bioinformatics walk-through: Accessing protein-protein interaction interfaces for all known protein structures with PDBe PISA

If this summer’s posting became a little infrequent, part of the blame lies with computational research I’ve been working on, regarding the systems biology of chromosomal translocations and the ensuing chimeric proteins at the Medical Research Council Laboratory of Molecular Biology in Cambridge. A sizeable part of bioinformatics ‘dry lab’ work falls into what has been described in the Overcoming D3 Cartographic Envy With R + ggplot

When I used one of the Scotland TopoJSON files for a recent post, it really hit me just how much D3 cartography envy I had/have as an R user. Don’t get me wrong, I can conjure up D3 maps pretty well and the utility of an interactive map visualization goes without saying, but

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How to draw venn pie-agram (multi-layer pie chart) in R?

September 25, 2014
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How to draw venn pie-agram (multi-layer pie chart) in R?

I was wondering how to draw a venn diagram like pie chart in R, to show the distribution of my RNA-seq reads mapped onto different annotation regions (e.g. intergenic, intron, exons etc.). A google search returns several options, including the nice one...

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Top open R jobs (for September 25th 2014)

September 25, 2014
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Top open R jobs (for September 25th 2014)

This is the bimonthly R Jobs post (for 2014-09-25), based on the R-bloggers’ sister website: R-users.com. If you are an employer who is looking to hire people from the R community, please visit this link to post a new R job (it’s free, and registration takes less than 10 seconds). After almost 8 months, this is the first time that two weeks had pass without a single new job to share. As compensation, I...

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Brazilian Presidential Election

September 25, 2014
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Brazilian Presidential Election

Three major polling houses published their polls this week: MDA, Ibope, and Vox Populi. The following numbers incorporate these data. With current data, a runoff between Dilma and Marina seems to be inevitable (.87), though its certainty has decreased from the previous week as the following chart indicates. How to understand the following plots: The … Read More...

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Effective Applications of the R Language Conference 2014

September 25, 2014
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Effective Applications of the R Language Conference 2014

By Chris Campbell – Senior Consultant, UK. What struck me first was how few sandals I could see, none of which were paired with socks. The energy in the room was electric as introductions were made and business cards were exchanged. The inaugural Effective Applications of the R Language (EARL) had started strongly with two sold-out workshops. As Matt Aldridge...

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Adding Google Drive Times and Distance Coefficients to Regression Models with ggmap and sp

September 24, 2014
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Adding Google Drive Times and Distance Coefficients to Regression Models with ggmap and sp

Space, a wise man once said, is the final frontier. Not the Buzz Alrdin/Light Year, Neil deGrasse Tyson kind (but seriously, have you seen Cosmos?). Geographic space. Distances have been finding their way into metrics since the cavemen (probably). GIS seem to make nearly every science way more fun…and accurate! Most of my research deals with

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DVI Performance

September 24, 2014
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DVI Performance

This is the next post in the DVI indicator series. After the first two (here and here) analyzed in details the post-entry returns and the entry power of this indicator, it’s time to take a look at the trading performance. Using the Systematic Investor Toolbox, we get some pretty decent results: CAGR of 16.15% and

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