Difference between revisions of "Erin's equation"
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Giantsquid (talk | contribs) |
Giantsquid (talk | contribs) |
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| Line 14: | Line 14: | ||
implicit none | implicit none | ||
real(real64),intent(in) :: x | real(real64),intent(in) :: x | ||
| − | real(real64) :: m | + | real(real64) :: m,t |
| − | |||
t = 10**floor(log10(x)) | t = 10**floor(log10(x)) | ||
m = t * floor(x/t) | m = t * floor(x/t) | ||
Revision as of 19:06, 23 October 2015
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
function erin(x) result(m) use iso_fortran_env implicit none real(real64),intent(in) :: x real(real64) :: m,t t = 10**floor(log10(x)) m = t * floor(x/t) end function erin
Example
erin(9876.54321) = 9000.0
