Mantissa Check

Procedure based on this forum discussion.

This check is implemented in the feedback function fb_unit.

Question variables

ra(x,y):=stack_units_nums(stack_unit_si_to_si_base(x))/stack_units_nums(stack_unit_si_to_si_base(y));
mantissaOK(x,y,tol):= is( abs(round( log(ra(x,y))/log(10))-log(ra(x,y))/log(10))<tol); 

PRT

This example is in the context of a unitless question design but input with units.

Field	Value
Answer test	AlgEquiv
SAns	mantissaOK(S_A/m^2,A,0.005) Answer S_A with units is made unitless, compared to unitless reference A
TAns	true
true feedback	Die Mantisse stimmt, die Zehnerpotenz weicht aber um mindestens eine Größenordnung ab. Prüfen Sie Ihre Einheitenumrechnung.