Blog Archives

Book Review – Sound Analysis and Synthesis with R

November 3, 2018
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Book Review – Sound Analysis and Synthesis with R

R might not be the most obvious tool when it comes to analysing audio data. However, an increasing number of packages allows analysing and synthesising sounds. One of such packages is seewave. Jerome Sueur, one of the authors of seewave, now wrote a book about working with audio data in R. The book is entitled

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Spectrograms in R – a gallery

September 1, 2018
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Spectrograms in R – a gallery

Creating a spectrogram is a basic step in every analysis of audio signals. Spectrograms visualise how frequencies change over a time period. Luckily, there is a selection of R packages that can help with this task. I will present a selection of packages that I like to use. This post is not an introduction to

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Downloading UK property prices from Zoopla in R

January 6, 2018
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Downloading UK property prices from Zoopla in R

Zoopla allows a limited access to its API providing the latest property prices and area indices. I created a package in R that allows querying this database. See the GitHub documentation or zooplaR’s page for the latest info. You can easily get prices in the last couple of months or years for a particular postcode,

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How to add code coverage (codecov) to your R package?

June 24, 2017
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How to add code coverage (codecov) to your R package?

During the development of another R package I wasted a bit of time figuring out how to add code coverage to my package. I had the same problem last time so I decided to write up the procedure step-by-step. Provided that you’ve already written an R package, the next step is to create tests. Luckily,

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Using ESRI shapefiles to create maps in R

April 1, 2016
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Using ESRI shapefiles to create maps in R

R has a number of libraries that can be used for plotting. They can be combined with open GIS data to create custom maps. In this post I’ll demonstrate how to create several maps. First step is getting shapefiles that will be used to create maps. One of the sources could be this site, but

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Automatic pitch extraction from speech recordings

May 31, 2015
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Automatic pitch extraction from speech recordings

I needed to extract mean pitch values from audio recordings of human speech, but I wanted to automate it and easily recreate my analyses so I wrote a couple of scripts that can do it much faster. Here is a recipe for extracting pitch from voice recordings.   Cleaning audio files My audio files were

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