Issue #191 - January 21, 2019


More than you really wanted to know about patch

(Jan 13) #tools

Software patches are files designed to modify the content of other files in specific ways, and are an essential part of maintaining and improving widely distributed software. However, the way they are written and structured can be obscure and difficult for developers to grasp. In this article, Robert Landley introduces software patches, describing how they originated and detailing step by step how they work and how to write them.

Apollo program, Kalman Filter and go-filter

(Jan 13) #golang #history

The Kalman filter is an algorithm designed to accurately predict the future state of a dynamic system based on uncertain and incomplete information, and has a wide range of uses and applications in many different industries. Despite its widespread use, it was originally met with skepticism. In this article, Milos Gajdos describes how the Kalman filter finally established itself amidst the technical difficulties of the Apollo space missions, proving vital to their success - and also provides an example complete with a link to a GitHub package demonstrating how the Kalman filter works.

Haskell I/O and XPath

(Jan 13) #haskell

XPDLs (XPath Derived Laguages) are functional programming languages, which means they have difficulty dealing with side effects that commonly arise with I/O operations. However, there are functional programming languages such as Haskell that provide the facilities for implementing I/O operations that are free from side effects. In this paper, software developer Adam Retter discusses methods for implementing I/O operations in XPDLs without side effects, as well as their limitations, complete with examples.

Programming language of the day: Aphid. "Aphid is a unique multiparadigm language that can be interpreted or compiled. Although it began as an embedded scripting language for the .NET framework, over the years it grew into a standalone .NET language, as well as the ability to be compiled into other languages such as Python, PHP, and Verilog."

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