Erin's equation
Revision as of 20:41, 9 August 2019 by Giantsquid (talk | contribs)
Erin's equation is a mathematical function which computes the number that is the same order of magnitude as a given number, but with only one significant digit.
Python sourcecode
def erin(x):
from math import *
t = pow(10, floor(log10(x)))
return t * floor(x/t)
Fortran sourcecode
pure function erin(x) result(m)
use iso_fortran_env, only: wp => real64
implicit none
real(wp),intent(in) :: x
real(wp) :: m,t
t = 10**floor(log10(x))
m = t * floor(x/t)
end function erin
Example
erin(9876.54321) = 9000.0