Scott: I remember there being another discussion but I can't seem to find
it. How did you try to get in touch? Do you want to start a github issue
and I'll comment there?
On Thursday, June 18, 2015 at 10:20:08 AM UTC-4, Scott Jones wrote:
>
> This was already discussed recently, here on julia-users, I'm trying to
> get in touch with Dahua Lin (author of Formatting.jl)
> to see about adding a simpler `sfmt` that would help with this).
>
> On Thursday, June 18, 2015 at 10:13:46 AM UTC-4, Tom Breloff wrote:
>>
>> I wonder if what we really need is just some extra additions to
>> Formatting.jl (since I think this is the best place to keep standard
>> formatting calls). We could add fmt2, fmt3, etc which would be meant for
>> formatting floats to that precision. I suspect that's the most common use
>> of formatting. Additionally, just a shorter name than "generate_formatter"
>> might help adoption for non-standard formatting. If this makes sense to
>> people, I'll start an issue on github, and perhaps a PR as well.
>>
>>
>> julia> using Formatting
>>
>> julia> fmt2 = generate_formatter("%1.2f")
>> sprintf_JTEuMmY! (generic function with 1 method)
>>
>> julia> fmt3 = generate_formatter("%1.3f")
>> sprintf_JTEuM2Y! (generic function with 1 method)
>>
>> julia> @time fmt2(31231.345435245)
>> 55.763 milliseconds (33974 allocations: 1444 KB)
>> "31231.35"
>>
>> julia> @time fmt2(31231.345435245)
>> 13.573 microseconds (15 allocations: 608 bytes)
>> "31231.35"
>>
>> julia> @time fmt3(31231.345435245)
>> 11.193 milliseconds (5882 allocations: 254 KB)
>> "31231.345"
>>
>> julia> @time fmt3(31231.345435245)
>> 16.231 microseconds (15 allocations: 608 bytes)
>> "31231.345"
>>
>>
>>
>>
>> On Thursday, June 18, 2015 at 3:55:01 AM UTC-4, [email protected] wrote:
>>>
>>> You could use a type:
>>>
>>> julia> type Out
>>> n::Float64
>>> end
>>>
>>> julia> function Base.show(io::IO, n::Out)
>>> print(io, "$(round(n.n, 2))")
>>> end
>>> show (generic function with 83 methods)
>>>
>>> then you can just use Out(x) whenever you want x rounded to 2 d.p.
>>>
>>> julia> for i in 0.7454539:1.5:5
>>> println("i is $i and displayed as $(Out(i))")
>>> end
>>> i is 0.7454539 and displayed as 0.75
>>> i is 2.2454539000000002 and displayed as 2.25
>>> i is 3.7454539000000002 and displayed as 3.75
>>>
>>>
