The F# Journal just published an article about GUI programming:
"Phil Tomson has been collating implementations of a simple kth-nearest neighbor classifier based upon an optical character recognition challenge by Kaggle. There is some scope for optimising the current F# implementation. This article takes a look at the idioms and particularly the performance characteristics of the current code (comparing it to other solutions) and how it might be improved. We also take the opportunity to look at performance profiling that is now freely available in Visual Studio Community 2013..."
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