> This is what makes me so uncomfortable about numerical computing (e.g. CFD): how do you know you got it right? Indeed. Lack of associativity and distributiv

> This is what makes me so uncomfortable about numerical computing (e.g. CFD): how do you know you got it right? Indeed. Lack of associativity and distributivity when working with floating point numbers gives the whole thing a feeling of spooky witchcraft. It's precisely the same feeling that I get from Javascript and PHP's weird notions of equality ("==" vs "===").