989 search results for "how to import image file to R"

R User Group Recap: Heatmaps and Using the caret Package

April 10, 2015
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R User Group Recap: Heatmaps and Using the caret Package

At our most recent R user group meeting we were delighted to have presentations from Mark Lawson and Steve Hoang, both bioinformaticians at Hemoshear. All of the code used in both demos is in our Meetup’s GitHub repo.Making heatmaps in RSteve started with an overview of making heatmaps in R. Using the iris dataset, Steve demonstrated...

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White Matter Segmentation in R

April 7, 2015
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White Matter Segmentation in R

Goals and Overall Approach We will use multiple packages and pieces of software for white matter (and gray matter/cerebro spinal fluid (CSF)) segmentation. The overall approach will be, with the required packages in parentheses: N4 Inhomogeneity Bias-Field Correction (extrantsr and ANTsR) Brain extraction using BET and additional tools (extrantsr and fslr) FAST for tissue-class segmentation.

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Predicting Mobile Phone Prices

April 6, 2015
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Predicting Mobile Phone Prices

Recently a colleague of mine showed me a nauseating interactive scatterplot that plots mobile phones according to two dimensions of the user’s choice from a list of possible dimensions.  Although the interactive visualization was offensive to my tastes, the JSON … Continue reading →

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SWMPr 2.0.0 now on CRAN

April 5, 2015
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SWMPr 2.0.0 now on CRAN

I’m pleased to announce that my second R package, SWMPr, has been posted on CRAN. I developed this package to work with water quality time series data from the System Wide Monitoring Program (SWMP) of the National Estuarine Research Reserve System (NERRS). SWMP was established in 1995 to provide continuous environmental data at over 300

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Tips & Tricks 8: Examining Replicate Error

April 4, 2015
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Geomorph users,When starting out in a geometric morphometrics study, the common questions are ones of repeatability and measurement error.How much of the variation in the Procrustes residuals is due to human (digitizing) error? How much is du...

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How and why to return functions in R

April 3, 2015
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How and why to return functions in R

One of the advantages of functional languages (such as R) is the ability to create and return functions “on the fly.” We will discuss one good use of this capability and what to look out for when creating functions in R. Why wrap/return functions? One of my favorite uses of “on the fly functions” is … Continue reading...

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The Price of Fuel: How Bad Could It Get?

April 1, 2015
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The Price of Fuel: How Bad Could It Get?

The cost of fuel in South Africa (and I imagine pretty much everywhere else) is a contentious topic. It varies from month to month and, although it is clearly related to the price of crude oil and the exchange rate, various other forces play an influential role. According to the Department of Energy the majority The post

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Mapping Flows in R

March 30, 2015
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Mapping Flows in R

Last year I published the above graphic, which then got

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Machine Learning in R for beginners

March 25, 2015
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Machine Learning in R for beginners

Introducing: Machine Learning in R Machine learning is a branch in computer science that studies the design of algorithms that can learn. Typical machine learning tasks are concept learning, function learning or “predictive modeling”, clustering and finding predictive patterns. These tasks are learned through available data that were observed through experiences or instructions, for example. The post

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Release of psd 1.0 to CRAN

March 23, 2015
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Release of psd 1.0 to CRAN

Greetings, Interweb! I’m pleased to announce psd 1.0, a long-overdue major update from the 0.* series which includes significant advancements in performance, improved clarity and consistency of documentation and method/class handling, and the elimination a few long-standing bugs. Some major changes include: … Continue reading →

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