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No question it would not make sense in that original 4K or even 8K BASIC, but MS produced BASICs with much larger memory budget and the matrix ops never appeare

• Someone 6y ago
  They added tons of stuff that made business sense to them. Apparently, matrices as built-in types didn’t. Nowadays, the language is powerful enough to implement them as a library (e.g. https://www.freevbcode.com/ShowCode.asp?ID=3682 https://www.freevbcode.com/ShowCode.asp?ID=3682. Operator overloading became possible at some time, too. https://docs.microsoft.com/en-us/dotnet/visual-basic/programming-guide/language-features/procedures/how-to-define-an-operator https://docs.microsoft.com/en-us/dotnet/visual-basic/program...) It’s not as if they don’t know matrices exist. Excel has matrix operations (https://support.microsoft.com/en-us/office/mmult-function-40593ed7-a3cd-4b6b-b9a3-e4ad3c7245eb https://support.microsoft.com/en-us/office/mmult-function-40...)