jj / p6-math-constants Goto Github PK

it would be good for a browsing user to easily see what constants are defined

Dear JJ, I see that you write this in your excellent module:

[in Math::Constants]
my constant plancks-h is export = 6.626_070_015e-34; # exact

In my world (https://github.com/p6steve/raku-Physics-Measure/blob/master/README.md) I would write:

use Physics::Measure;
my $h ♎️ "6.626196e-34 J/s";
say ~($h * 1e34); #6.626 J/s
say $h.WHAT; #(Power)

I am trying to avoid hard coding the physical constants into Physics::Measure since Math::Constants already does a much better job!

I have in mind conceptually::
0. A new raku module - lets say Physics::Constants, it does...

1. use Math::Constants to get the numbers (and unit definition?)
2. for all-symbols { my constant * is export ♎️ "*.Real *.UnitDefn" }

I attach a suggested an informal object mapping diagram - red is Physic::Measure, green is Math::Constant, purple is my new module suggestion.

Please let me know if this makes any sense and you are open to the idea? If so, I am happy to code this up, test and submit - really as you decide.

kind regards
p6steve

Add a mathematical or physical constant with its corresponding test.

1. The module superfluously defines e and pi, and in the case of pi has an incorrect value!

2. Since 2019-05-20, planck's constant and the electron charge have defined values, different to those in this module. According to Wikipedia, the new values are 6.626_070_15e-34 and 1.602_176_634e-19 respectively.

Since that effectively redefines the meter and the ampere, this may have side-effects for other constants. (The obvious one is Planck's reduced constant.)

So called alpha