From: muraken@...
Date: 2021-04-01T03:14:48+00:00
Subject: [ruby-core:103144] [Ruby master Feature#17769] Proposal: numeric	coefficient syntax

Issue #17769 has been updated by mrkn (Kenta Murata).

File num_coeff.patch added

I replaced the attached patch with changes to accept not only `2x` but also `2(x + 1)`.

----------------------------------------
Feature #17769: Proposal: numeric coefficient syntax
https://bugs.ruby-lang.org/issues/17769#change-91217

* Author: mrkn (Kenta Murata)
* Status: Open
* Priority: Normal
----------------------------------------
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
�� = 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--------------------------------
num_coeff.patch (394 Bytes)


-- 
https://bugs.ruby-lang.org/

Unsubscribe: <mailto:ruby-core-request@ruby-lang.org?subject=unsubscribe>
<http://lists.ruby-lang.org/cgi-bin/mailman/options/ruby-core>