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Scientific Computing in Ruby at Ruby World Conf...
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Sameer Deshmukh
November 03, 2016
Programming
1
200
Scientific Computing in Ruby at Ruby World Conference 2016.
Talk on Scientific Computing in Ruby at Ruby World Conference, Matsue City, Shimane, Japan.
Sameer Deshmukh
November 03, 2016
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Transcript
namaste
Incredible India
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None
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India must master Western science and yet preserve its Culture
and Heritage. What India Dreams
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City of Pune. Population: 6 million. Oxford of the East.
Sameer Deshmukh github.com/v0dro @v0dro
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Dr. Gopal Deshmukh Sameer Desmukh Dr. Hemchandra Deshmukh Dr. Satish
Deshmukh
www.soundcloud.com/catkamikazee Sameer
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Pune Ruby Users Group www.punerb.org @punerb @punerb @deccanrubyconf www.deccanrubyconf.org
Ruby Science Foundation www.sciruby.com @sciruby @sciruby
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Scientific Computing In Ruby
iruby notebook
Browser based Ruby REPL for interactive computing.
Runs in your browser Input cell – accepts Ruby code
Output cell – can render HTML/CSS/JS
None
nmatrix
ndimensional array object. Interface Ruby with high speed C libraries.
require 'nmatrix' n = NMatrix.new( [2,2], [1,2,3,4], dtype: :float32, stype:
:dense ) n[0,1] # => 2.0
Data Types :int8 :float32 :int16 :float64 :int32 :complex64 :int64 :complex128
Storage types Dense Dense matrix. List Sparse matrix type storing
data as a linked list. Yale Sparse type storing data in the 'New Yale' format.
NMatrix C API
nmatrix nmatrix atlas nmatrix lapacke nmatrix fftw gsl
nyaplot
Interactive plotting tool for Rubyists.
interactive HTML and JavaScript plots that can be displayed in
your browser.
None
Mapnya Nyaplot3D Bionya Map visualizations with inbuilt country charts. Three
Dimensional interactive plots. Biology plots for visualizing relationships of genes.
daru (Data Analysis in RUby)
daru == (Hindi) ददार sake alcohol
library for analysis, cleaning, manipulation and visualization of data.
Read/write many data sources Ephemeral statistics functions Works well with
'wild' data Data indexing
Acts as glue between other SciRuby libraries.
Daru::Vector Heterogenous Array that can be indexed on any Ruby
object. Name Label(0) Label(1) Label(2) ... Label(n-1)
Daru::DataFrame 2D spreadsheet like data structure indexed by rows or
columns. Col0 Label(0) Label(1) Label(2) ... Label(n-1) Col1 Col2 Col(n-1) ....
New Ideas for better Ruby
“Any sufficiently advanced technology is indistinguishable from magic.” Arthur
C. Clarke
Writing C extensions • FFI gem. • Rice. • SWIG.
• Writing C bindings manually.
Rubyist! Write me a C extension!
def factorial n n > 1 ? n*factorial(n-1) : 1
end
unsigned long long int calc_factorial(unsigned long long int n) {
return (n > 1 ? n*calc_factorial(n-1) : 1); } static VALUE cfactorial(VALUE self, VALUE n) { return ULL2FIX( calc_factorial(NUM2ULL(n))); }
void Init_factorial() { VALUE cFact = rb_define_class("Fact", rb_cObject); rb_define_method(cFact, "factorial",
cfactorial, 1); }
a = Fact.new a.factorial(8000)
Big Problems • Difficult and irritating to write. • Time
consuming to debug. • Tough to trace memory leaks. • Change mindset from high level to low level language. • Need to care about small things.™* *Matz – Keynote at Red Dot Ruby Conf 2016, Singapore.
Rubex
Rubex is a Crystalinspired superset of Ruby that compiles to
C.
class Fact def factorial(unsigned long long int n) n >
1 ? n*factorial(n-1) : 1 end end
# Create a C static array and return a Ruby
Array def adder(n) a = StaticArray(i32, n) i32 i = 0 i32 sum = 0 a.each(n) { a[i] = i*5 } for 0 <= i < n do sum += a[i] end sum end
Received the Ruby Association Grant 2016 for development of Rubex
https://github.com/v0dro/rubex
Scientific Computing on JRuby
NMatrix and NArray are a linear algebra libraries for Ruby
similar to numpy.
NMatrix C/C++ core CRuby interpreter Numo::NArray C core CRuby interpreter
JRuby backend for the NMatrix Ruby API – Sci. Computing
on JVM.
Allows interfacing JRuby libraries with jBLAS for performance. Uses Apache
Commons Math library for storage and operations on internal Java arrays.
https://github.com/prasunanand/ nmatrix/tree/jruby_port
Symbolic Computation in Ruby with symengine.rb
(x – y) * (x ** y / z)
require 'symengine' x = SymEngine::Symbol.new("x") y = SymEngine::Symbol.new("y") z =
SymEngine::Symbol.new("z") f = (x – y) * (x ** y / z) f.expand.to_s # x**(1 + y)/z – x**y*y/z f == - (x**y*y/z) + (x**y*x/z) # true
https://github.com/symengine/ symengine.rb
Ruby in Space
NASA SPICE Ruby wrapper spice_rub
require 'spice_rub' k_pool = SpiceRub::KernelPool.instance k_pool.load_folder("spec/data/kernels") epoch = SpiceRub::Time.now moon
= SpiceRub::Body.new(:moon) earth = SpiceRub::Body.now(:earth) earth.position_at(epoch) moon.distance_from(:earth, epoch) # 395791.1464913574 (Km)
https://github.com/gau27/spice_rub
Cool SciRuby Stickers
Thank You Ruby World Conf!
Any questions?