Machine Epsilon

Machine epsilon gives an upper bound on the relative error due to rounding in floating point arithmetic. This value characterizes computer arithmetic in the field of numerical analysis, and by extension in the subject of computational science. The quantity is also called macheps or unit roundoff, and it has the symbols Greek epsilon or bold Roman u, respectively.

Read more about Machine EpsilonValues For Standard Hardware Floating Point Arithmetics, Formal Definition, Arithmetic Model, Variant Definitions, How To Determine Machine Epsilon

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How To Determine Machine Epsilon - Approximation Using Fortran
... In Fortran 90 and more recent standards machine epsilon can be inquired by the intrinsic function epsilon ... selected_real_kind(15, 307) macheps = epsilon(1.0_dp) An approximation in Fortran 77 is PROGRAM MACHINEEPSILON IMPLICIT NONE DOUBLE PRECISION MACHEPS MACHEPS ...

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