java r excel

Error in .jcall(“RJavaTools”…) when importing large xlsx files in R

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Recently I had to read in a folder full of large Excel (.xlsx) files. I did as I usually did and use the xlsx library. However, reading in the largest files produced an error: “Error in .jcall(“RJavaTools”, “Ljava/lang/Object;”, “invokeMethod”, cl, : java.lang.OutOfMemoryError: Java heap space” I don’t know what cause… Read More »Error in .jcall(“RJavaTools”…) when importing large xlsx files in R

date conversion excel r

Date conversion from Excel to R

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It happened too many times before I write this blog post. Oftentimes, when I read Excel (xls or xlsx) files into R, I encounter this strange phenomenon where dates are converted to a 5 number integer. Here is how to fix it. For example, 02/01/2017 (dd/MM/yyyy) would be converted to… Read More »Date conversion from Excel to R

machine bias

Over racistische machines

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In het boek Outnumbered gaat auteur David Sumpter op zoek naar de beperkingen van de algoritme-hype. In het hoofdstuk Impossibly unbiased beschrijft hij hoe algoritmes fouten kunnen maken. Hij kwam terecht bij justitie, in de VS. Zo publiceerde ProPublica in 2016 een artikel dat een gevoelige snaar raakte bij data… Read More »Over racistische machines

intelligent tracking prevention

An almost complete overview of Apple WebKit’s Intelligent Tracking Prevention

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Historically, browsers have had a great deal of control over the online experience of end users. Since their genesis, several different browsers have competed for dominant market share. With the arrival of Intelligent Tracking Prevention (ITP), it seems that big tech is now using browser standards to target each other’s… Read More »An almost complete overview of Apple WebKit’s Intelligent Tracking Prevention

“Hit Refresh”: Or how one man’s personal life helped Microsoft rediscover its soul

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Another management book? Not just a management book, but the story of Satya Nadella. Who? The son of a marxist economist and a drama professor but mostly known as Microsoft’s less famous, less rich, but current CEO. A brief review. Nadella’s book ‘Hit Refresh’ is a triptych. The first part… Read More »“Hit Refresh”: Or how one man’s personal life helped Microsoft rediscover its soul