Print intervals as 3..4?

[dpsanders]

Maybe it would be less confusing to print out intervals as 3..4 instead of [3, 4]?

[dpsanders]

Or using brackets with 2 vertical bars?

cc @yurivish

[lbenet]

Why not having both options, so the user can decide? We already have @format :midpoint...

[Kolaru]

The .. format may be kind of confusing with decimal numbers: -3.21..5.67 (dots everywhere!).

[dpsanders]

Yes I agree that we should have both options available.

I actually find -3.21..5.67 quite readable myself. Or add a space:

julia> -3.21 .. 5.67
[-3.21001, 5.67001]

[lbenet]

Yes, add spaces!

[perrutquist]

The repr function falls back to show, and repr(x) is often Julia code that creates x, so it would seem logical to print out either 3 .. 4 or 3.5 ± 0.5. (Especially since [3, 4] creates a vector.)

I'd personally find it really useful if I could copy-paste from the output and get a new interval with a guarantee to contain the original interval (even if it does not recreate it exactly).

Whether or not to add spaces could be determined by get(io, :compact, true). That's how it's done for complex numbers.

[dpsanders]

Note that you can already have the midpoint-radius version:

julia> @format midpoint
Display parameters:
- format: midpoint
- decorations: false
- significant figures: 6

julia> 3..4
3.5 ± 0.5

[Kolaru]

For the default it is not a clear cut.

However as opposed to what the Julia doc recommends, we don't have a show method (e.g. repr) that can be copy pasted to reconstruct the printed object.

The IEEE standard already may mention something about it.

[dpsanders]

That is implemented in @format full, but agreed that repr should probably return that.

[Kolaru]

Fixed in #555