## From bad to worse [Software]

Hi fellows,

Sorry guys, but there are some things going back behind the scene, which I really fail to understand.

If I get -2,77556E-17 when I type =(0.5-0.4-0.1), how comes that I get 0 when I type =(-0.1-0.4+0.5) ? The same figures, just in a different order ?

If I get FALSE when I type =0=0.5-0.4-0.1, how comes that I get TRUE when I type =0=-0.4-0.1+0.5 ?

And to be fair to Excel, the same happens in :

0==(0.5-0.4-0.1)
[1] FALSE
0==(-0.4-0.1+0.5)
[1] TRUE

Are they first calculating -0.4-0.1=-0.5, which is nicely binarily coded, then -0.5+0.5=0 ?

Regards
Ohlbe

### Complete thread:

Admin contact
22,165 posts in 4,645 threads, 1,572 registered users;
online 4 (0 registered, 4 guests [including 3 identified bots]).
Forum time: Saturday 12:58 CEST (Europe/Vienna)

Absolute certainty is a privilege of uneducated minds  and fanatics.
It is, for scientific folk, an unattainable ideal.    Cassius J. Keyser

The Bioequivalence and Bioavailability Forum is hosted by
Ing. Helmut Schütz