Re: SEQ BUG

[John Cowan]

Patrick Amstutz scripsit:

> $ echo `seq 0.0 0.1 0.8`
> 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
> $ echo `seq 0.0 0.1 0.9`
> 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8

Welcome to floating-point roundoff errors.  The decimal constant 0.1
cannot be exactly represented as a floating-point number on modern
hardware, so 0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1+0.1 is actually greater
than 0.9; consequently, 0.9 is not printed.

You should never iterate using floating-point fractions for this reason.

-- 
Where the wombat has walked,            John Cowan <address@hidden>
it will inevitably walk again.          http://www.ccil.org/~cowan