Question

I want to be able to compare two doubles disregarding a possible precision loss. Is there a method already that handles this case?

If not, is there a threshold/guideline to know how much is an adequate equivalence between two doubles?

Answer 1

The threshold is completely dependent to the problem itself. For some problems, you might consider 1.001 equal to 1.002 and for some problems, you might need a much smaller threshold.

The general techique is:

Math.Abs(a - b) < some_epsilon    // `a` is roughly equivalent to `b`