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Floating-point relative accuracy
eps
eps
returns the distance from 1.0 to the next largest floating-point number.
The value eps is a default tolerance for pinv and rank, as well as several other MATLAB functions. On machines with IEEE floating-point arithmetic, eps = 2^(-52), which is roughly 2.22e-16.
realmax Largest positive floating-point number
realmin Smallest positive floating-point number