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

Arc Diagrams in R: Les Miserables

February 3, 2013
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Arc Diagrams in R: Les Miserables

In this post we will talk about the R package “arcdiagram” for plotting pretty arc diagrams like the one below: Arc Diagrams An arc diagram is a graphical display to visualize graphs or networks in a one-dimensional layout. The main idea is to display nodes along a single axis, while representing the edges or connections … Continue reading...

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Bayesian model choice for the Poisson model

February 1, 2013
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Bayesian model choice for the Poisson model

Following Arthur Charpentier‘s example, I am going to try to post occasionally on material covered during my courses, in the hope that it might be useful to my students, but also to others. In the second practical of the Bayesian Case Studies course, we looked at Bayesian model choice and basic Monte Carlo methods, looking

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My template for controlling publication quality figures

January 28, 2013
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My template for controlling publication quality figures

The following is a template that I usually start with when producing figures for publication. It allows me to control:The overall size of the figure (in inches) (WIDTH, HEIGHT)The layout of figure subplots (using the layout() function) (LO)The resoluti...

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A slightly different introduction to R, part II

January 27, 2013
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A slightly different introduction to R, part II

In part I, we looked at importing data into R and simple ways to manipulate data frames. Once we’ve gotten our data safely into R, the first thing we want to do is probably to make some plots. Below, we’ll make some simple plots of the made-up comb gnome data. If you want to play

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R and foreign characters

January 25, 2013
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R and foreign characters

Working with Russian characters can be mind-numbingly frustrating. This is true for R, as for other applications, so below I've written out the my top five tricks for making Russian inputs work in R; i believe they should be transferable to most other languages....

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Maps in R: choropleth maps

January 23, 2013
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Maps in R: choropleth maps

This is the third article of the Maps in R series. After having shown how to draw a map without placing data on it and how to plot point data on a map, in this installment the creation of a … Continue reading →

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Management of Research Data – a Shell+Python+Excel+R Approach

January 23, 2013
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Management of Research Data – a Shell+Python+Excel+R Approach

I am a computer science researcher, usually working on both Windows and Linux system. Windows is the place where I do the document work, like reading paper, browsing the internet, writing papers with LaTex… Linux is where I run and generate experimental results. The Chaos After years of messy data management and recent data chaos,

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Going Beyond Florence Nightingale’s Data Diagram: Did Flo Blow It with Wedges?

January 23, 2013
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Going Beyond Florence Nightingale’s Data Diagram: Did Flo Blow It with Wedges?

In 2010, I wrote a short blog item about Florence Nightingale the statistician, solely because of its novelty value. I didn't even bother to look closely at the associated graphic she designed, but that's what I intend to do here. In this first installment, I reflect on her famous data visualization by reconstructing it...

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Reducing Respondent Burden: Item Sampling

January 22, 2013
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Reducing Respondent Burden: Item Sampling

You received confirmation this morning.  Someone made a mistake programming that battery of satisfaction ratings on your online survey.  Instead of each respondent rating all 12 items using a random rotation, only six randomly selected i...

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Data fishing: R and XML part 2

January 21, 2013
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Data fishing: R and XML part 2

I’m constantly amazed at what can be done using free software, such as R, and more importantly, what can be done with data that are available on the internet. In an earlier post, I confessed to my sedentary lifestyle immersed in code, so my opinion regarding the utility of open-source software is perhaps biased. None

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