It is not called "unit matrix" but "identity matrix" in English.
You need multiple tests to check a variety of situations.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
improve test suite
Swap the first and last columns
Back to basics 21 - Matrix replicating
02 - Vector Variables 2
Length of the hypotenuse
Rounding off numbers to n decimals
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