Learned this 50 years ago in high school... never had occasion to use it in the real world. However, I did have occasion to use matrix math to do non-linear regression a couple of times about 10 years later. (Imagine storing thermocouple tables in just 5 or 6 floats!) I was never very good at the hand calculations, but I was great at coding it in C. Worked just fine! :)
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Learned this 50 years ago in high school... never had occasion to use it in the real world. However, I did have occasion to use matrix math to do non-linear regression a couple of times about 10 years later. (Imagine storing thermocouple tables in just 5 or 6 floats!)
I was never very good at the hand calculations, but I was great at coding it in C. Worked just fine! :)