Marshall Lochbaum

Marshall W. Lochbaum of Raleigh, North Carolina, is a software developer and programming language implementer. At University of North Carolina at Chapel Hill, he earned a Master of Computer Science degree, was distinguished with the highest honours in mathematics as a Bachelor in Mathematics and Computer Science with a minor in Physics, and received the 2013 Alfred T. Brauer and 2014 Archibald Henderson prizes. Lochbaum is the designer and implementer of the I programming language which generalizes the array and functional capabilities of J to deal with a much broader variety of data structures.

Career

Before joining Dyalog, Lochbaum programmed extensively in J, both as a hobbyist and as a professional at ThomasNet and BEST, llc. He has also contributed to the J interpreter.

Since February 2017, he has worked as a software developer at Dyalog Ltd., mainly on speeding up the implementation of Dyalog APL, but also contributing to language development. He has achieved significant speed-ups across all parts of the language, implemented new primitives, and designed extensions to existing ones. He also is a frequent workshop host and presenter and Dyalog User Meetings and other events.

Publications

Notable software projects

• JSound: J scripts for sound processing and synthesis
• JtoLaTeX: LaTeX-formatted documents using J evaluation
• I: a tacit functional language inspired by J

Conference presentations

• Jsoftware Conference 2012: Image processing in J
• Jsoftware Conference 2014: Using Data as Code
• Dyalog '17: D08: Moving Bits Faster in Dyalog 16.0
• Dyalog '18: D08: Sub-nanosecond Searches Using Vector Instructions
• Dyalog '18: D15: The Interpretive Advantage
• LambdaConf 2019: Outer Product as an Introduction to APL and a Pretty Cool Thing in General
• Dyalog '19: D04: Tacit Techniques with Dyalog version 18.0 Operators
• Dyalog '19: D09: Implementing Reduction