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Picturing the output of a neural net

Another one from my new site coppelia.io. Some time ago during a training session a colleague asked me what a surface plot of a two input neural net would look like. That is, if you have two inputs x_1 and x_2 and plot the output y as a surface what do you get? We thought … Continue reading

The Analyst’s Toolbox

Another post from my new website coppelia.io There are hundreds, maybe thousands, of open source/free/online tools out there that form part of the analyst’s toolbox. Here’s what I have on my mac for day to day work. Read more..

Excuses and Opportunities

Regular readers of the blog will have noticed that I haven’t been a regular contributor to the blog over the last year. There are some good reasons/excuses for that, predominantly around buying and renovating our new home, getting married and starting a new job at Facebook. Having an Arsenal season ticket also doesn’t help. I … Continue reading

Clegg vs Pleb: An XKCD-esque chart

I saw an interesting “challenge” on StackOverflow last night to create an XKCD style chart in R. A couple of hours later & going in a very similar direction to a couple of the answers on SO, I got to something that looked pretty good, using the sin and cos curves for simple and reproducible … Continue reading

Why are pirates called pirates?

In homage to International Talk Like a Pirate Day… I recently stumbled across a series of blog posts from the folks at IDV that visualised the archive of recorded pirate attacks which has been collected by the US National Geospatial-Intelligence Agency. It’s a dataset of 6000+ pirate attacks which have been recorded over the last 30 … Continue reading

R: Dealing with package updates

Here’s a very short post to highlight one of the “highlights” of my week that I thought was worth sharing with the wider community. One of the things I find great about R is the rapidly evolving ecosystem where new packages are being constantly created and others are being updated. Up until now, I’ve found … Continue reading

Another visualisation of 118 Years of US Weather Data

I posted yesterday about weather data sourced from NOAA to look at how hot this March was compared to previous years and used a couple heat maps in R to look at how temperatures compared based on using the rank of each year for each state (so if, say this March in Florida was the … Continue reading

118 years of US State Weather Data

A recent post on the Junkcharts blog looked at US weather dataand the importance of explaining scales (which in this case went up to 118). Ultimately, it turns out that 118 is the rank of the data compared to the previous 117 years of data (in ascending order, so that 118 is the highest). At … Continue reading

Book Review: The Art of R Programming

Over the past few months, there have been several glowing reviews of The Art of R Programming by Norman Matloff, which led me to give it a go and buy it for my Kindle. I’ve just finished reading it and am adding to that list of glowing reviews.  Having been using R in varying amounts … Continue reading

Non overlapping labels on a ggplot scatterplot

This is a very quick post just to share a quick tip on how to add non overlapping labels to a scatterplot in ggplot using a great package called directlabels. The trick is to make each point a single member group using an aesthetic like colour and then apply the direct.label function with the first.qp … Continue reading

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