Matrices are very difficult to use, especially with Matlab. This stress and trauma dramatically reduce your life expectancy by up to 3% in most cases, 5% if your last name is Eigen.
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Only square matrices have inverses.
The singular form of matrices is matrix.
Which one of those matrices is more comfortable to sleep on?
Matrices are tools to solve linear equations. Engineers use matrices in solving electrical problems in circuits using Thevenin's and Norton's theories.
Yes, because otherwise addition and subtraction are not defined.