Syntax across languages

[gene tani]

APL, i haven't thought about that in 15 years.  I think it was (quad)CT
for comparison tolerance, at least in IBM APL.

Alex Martelli wrote:
> Tom Anderson <twic at urchin.earth.li> wrote:
>    ...
> > What would approximate FP equality even mean? How approximate?
>
> In APL, it meant "to within [a certain quad-global whose name I don't
> recall] in terms of relative distance", i.e., if I recall correctly,
> "a=b" meant something like "abs(a-b)/(abs(a)+abs(b)) < quadEpsilon" or
> thereabouts.  Not too different from Numeric.allclose, except the latter
> is "richer" (it takes both absolute and relative "epsilons", and also
> implies an "and-reduce" if the objects being compared are arrays).
> 
> 
> Alex