# Symbolic math in pure ruby **URL:** \ **Category:** Ruby\ **Created:** [December 16, 2009, 8:06pm UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294 "2009-12-16T20:06:26Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 16, 2009, 8:06pm UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/1 "2009-12-16T20:06:26Z")
[GitHub - brainopia/symbolic: Symbolic math for ruby](http://github.com/brainopia/symbolic) - for people interested in symbolic math in pure ruby, i would love contribution from community. ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 16, 2009, 11:11pm UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/2 "2009-12-16T23:11:26Z")
That looks really cool, thanks! I began something like that some time ago. Remembering I had some awful: module MathExp class Function def self.sq(x = nil) Function.new(:sq, x, ‘2x’, ‘x^3/3’) end I was using String for functions, as I didn’t know yet the power of coerce. But that was quite easy to get derivative and integral. Great job ! 2009/12/16 Ravil B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 17, 2009, 12:09am UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/3 "2009-12-17T00:09:57Z")
You should maybe try with -w: > ruby -vw symbolic.rb > ruby 1.9.2dev (2009-12-11 trunk 26067) [x86\_64-darwin10.2.0] /symbolic/summand.rb:73: warning: private attribute? /symbolic/factor.rb:71: warning: shadowing outer local variable - base /symbolic/factor.rb:117: warning: private attribute? The second is easy, but the others reveal strange use of attr\_reader. Why do you use attr\_reader in private context? This is only usefull in a public context I think, as instance variables can be directly accessed by @var (even when it is a variable from the superclass) It correctly pass all the tests, with one warning about drb(circular require) and these 3. Putting the attr\_reader before the “private” actually remove the warnings. 2009/12/16 Benoit D. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 17, 2009, 12:39am UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/4 "2009-12-17T00:39:48Z")
On Wednesday 16 December 2009 01:06:31 pm Ravil B. wrote: > [GitHub - brainopia/symbolic: Symbolic math for ruby · GitHub](http://github.com/brainopia/symbolic) - for people interested in symbolic > math in pure ruby, i would love contribution from community. Looks like it would’ve been pretty useful for an idea I had awhile ago… I ended up writing my own library. It’s a mess, too, but if you find anything useful, go for it: > **[GitHub - masover/math: Random mathematical tools built for a calculus...](https://github.com/masover/math)** > > Random mathematical tools built for a calculus class It’s even got a gemspec all ready to go, though I haven’t published a gem for it. ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 17, 2009, 9:32am UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/5 "2009-12-17T09:32:23Z")
2009/12/16 Ravil B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): > [GitHub - brainopia/symbolic: Symbolic math for ruby · GitHub](http://github.com/brainopia/symbolic) - for people interested in symbolic > math in pure ruby, i would love contribution from community. Thanks! That looks good. Kind regards robert ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 19, 2009, 3:41am UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/6 "2009-12-19T03:41:51Z")
Wonderful! ---
**Author:** ![ral](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/f04885/32.png) [@ral](https://www.ruby-forum.com/u/ral)\ **Post date:** [December 17, 2009, 5:41pm UTC](https://www.ruby-forum.com/t/symbolic-math-in-pure-ruby/180294/7 "2009-12-17T17:41:04Z")
On Dec 16, 2:06 pm, Ravil B. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > [http://github.com/brainopia/symbolic-](http://github.com/brainopia/symbolic-) for people interested in symbolic > math in pure ruby, i would love contribution from community. Cool beans. Your notation is very intuitive. I wonder if the same can be done for symbolic logic.