[erlang-questions] display floats without -e?
Tue Jan 1 11:43:41 CET 2019
Le 31/12/2018 à 20:31, Dan Sommers a écrit :
> On 12/31/18 10:37 AM, Vans S wrote:
> > > 1> 0.0001.
> > 0.0001
> > > 2> 0.00001.
> > 1.0e-5
> > Once floats get to the 4th/5th decimal place they start being
> > displayed with the e-x notation. Is there a way to make them always
> > display "normally", for example 0.00001 in this case ...
> At some point, it's shorter and easier to read with the e-x notation.
> Consider a number like 1e-44. The last thing I want is to have to count
> all those zeros. ;-)
> But you probably knew that.
> > ... The problem is when you turn the float into a string, its also
> > displayed as 1.0e-5, adding a format function works yes, but gets
> > annoying to maintain when you need to do arithmetic on the floats.
> > LIke sorting by the value.
> I'm confused: if you're doing arithmetic on the floats, why are you
> concerned with the strings?
> If you're sorting the strings, then you'll probably either (a) have to
> ensure a consistent format, perhaps with something like a ~24.18.0e
> specifier, or (b) convert the strings back to floats and suffer various
> rounding errors.
> > Also debugging becomes annoying when you see the e-5, e-6, etc
> > notation everywhere and have to match it up.
> On that we agree. :-)
> > Is there a way to compile / add arg to the VM to not do this?
> I'm pretty new at Erlang, so I'm probably missing a lot, but how are you
> displaying the values now if not with a format function? (I guess
> there's io:write, but at that point, you're awfully close to calling
> io:fwrite anyway.)
> Are you just using the shell to do immediate calculations? I'm sure
> that the shell has its own default formatting, or maybe it just calls
> erlang-questions mailing list
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