Calculate every resistor in a network from the outside

Bought to my attention by programming luminary Andy Cordani, was something he spotted here at Hackaday, which is a very nice application of multiplexing and matrix maths to determine the value of every resistor in an arbitrary network in which every node can be accessed by from the outside. Invented by ‘David’ on David’s Site, ...

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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/calculate-every-resistor-network-outside-2017-08/