Machine epsilon

http://en.wikipedia.org/wiki/Machine_epsilon

http://en.wikipedia.org/wiki/Machine_epsilon#Approximation_using_Fortran

Rounding is a procedure for choosing the representation of a real number in a floating point number system. For a number system and a rounding procedure, machine epsilon is the maximum relative error of the chosen rounding procedure.

Why doesn’t my application always give the same answer?

http://software.intel.com/sites/default/files/article/164389/fp-consistency-122712_1.pdf

machine epsilon을 구하는 subroutine은 다음 링크에서 다운로드 가능합니다.

https://github.com/orange224/subroutines/blob/master/uwa_mach.f90

subroutine(??) 만든 기념으로 몇가지 상수들까지 한꺼번에 계산해놨습니다. 각각의 상수들은 수치계산할때 생각보다 요긴하게 사용됩니다. ^^

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