Actions
Feature #17769
closedProposal: numeric coefficient syntax
Description
When we write a mathematical equation, we often omit a multiplication operator between a coefficient and a variable like 2x
.
I guess this convention can be useful in computer programming. Practically, Julia employs this notation:
julia> 2pi 6.283185307179586 julia> x = 3 3 julia> 2x 6 julia> pi π = 3.1415926535897... julia> 2pi 6.283185307179586
I wrote a proof-of-concept patch to introduce this notation in Ruby.
We can write the following with this patch:
irb(main):001:0> x = 3 => 3 irb(main):002:0> 2x => 6 irb(main):003:0> def pi = Math::PI => :pi irb(main):004:0> 2pi => 6.283185307179586
Files
Updated by matz (Yukihiro Matsumoto) 14 days ago
i = 10 p 2i # => 20 or Complex(0,2)?
Matz.
Updated by mrkn (Kenta Murata) 14 days ago
2i
is an imaginary number literal so it is Complex(0, 2)
.
Updated by mrkn (Kenta Murata) 14 days ago
- File num_coeff.patch added
I replaced the attached patch with changes to accept not only 2x
but also 2(x + 1)
.
Updated by mrkn (Kenta Murata) 14 days ago
- File num_coeff.patch num_coeff.patch added
Replace the patch with refactoring.
Actions