Blog Archives

UseR 2014, days 3-4

July 21, 2014
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UseR 2014, days 3-4

Three weeks ago, I’d commented on the first two days of the UseR 2014 conference. I’m finally back to talk about the second half. Dirk Eddelbuettel on Rcpp Dirk Eddelbuettel gave a keynote on Rcpp . The goal of Rcpp is to have “the speed of C++ with the ease and clarity of R.” He

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Why hadn’t I written a function for that?

July 16, 2014
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Why hadn’t I written a function for that?

I’m often typing the same bits of code over and over. Those bits of code really should be made into functions. For example, I’m still using base graphics. (ggplot2 is on my “to do” list, really!) Often some things will be drawn with a slight overlap of the border of the plotting region. And in

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2014 UseR conference, days 1-2

July 2, 2014
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2014 UseR conference, days 1-2

I’m at UCLA for the UseR Conference. I attended once before, and I really enjoyed it. And I’m really enjoying this one. I’m learning a ton, and I find the talks very inspiring. In my comments below, I give short shrift to some speakers (largely by not having attended their talks), and I’m critical in

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hipsteR: re-educating people who learned R before it was cool

May 15, 2014
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hipsteR: re-educating people who learned R before it was cool

This morning, I started a tutorial for folks whose knowledge of R is (like mine) stuck in 2001. Yesterday I started reading the Rcpp book, and on page 4 there’s an example using the R function replicate, which (a) I’d never heard before, and (b) is super useful. I mean, I often write code like

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Further points on crayon colors

May 9, 2014
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Further points on crayon colors

I saw this great post on crayola crayon colors at the Learning R blog, reproducing a nice graph of the Crayola crayon colors over time. (Also see this even nicer version.) The Learning R post shows how to grab the crayon colors from the wikipedia page, “List of Crayola crayon colors,” directly in R. Here’s

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Two more points about crayon colors

May 8, 2014
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Two more points about crayon colors

If you want to use crayon colors in R but you don’t want to rely on my R/broman package, you can just grab the code. Copy the relevant lines from the R/brocolors.R file: I spent a bit of time thinking about how best to sort the colors in a meaningful way, for the plot_crayons() function.

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Crayon colors in R

May 7, 2014
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Crayon colors in R

Last night I was working on a talk on creating effective graphs. Mostly, I needed to update the colors, as there’d been some gaudy ones in its previous form (e.g., slide 22). I usually pick colors using the crayons in the Mac Color Picker. But that has just 40 crayons, and I wanted more choices.

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“[” with the apply() functions, revisited

April 29, 2014
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“[” with the apply() functions, revisited

I’d mentioned in the fall that one could use "[" in the apply-type functions, like this: I just realized that you can use this with matrices, too. If you have a list of matrices, you can pull out rows and columns with this technique. As you can see, my data isn’t “tidy.”

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Googling errors

February 14, 2014
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Googling errors

@roguelynn tweeted the other day: If attendees of this weekend’s intro to python workshop leave with one thing, it’ll be to Google your error messages first and foremost. I had just talked about the technique in my Tools for Reproducible Research course, and I had a few recent examples. Gtk-WARNING **: cannot open display: I

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knitr in a knutshell tutorial

February 6, 2014
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knitr in a knutshell tutorial

I spent a lot of time this week writing a short tutorial on knitr: knitr in a knutshell. This is my third little tutorial. (The previous ones were a git/github guide and a minimal make tutorial.) I’m pleased with these tutorials. In learning new computing skills, it can be hard to get started. My goal

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