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Scientific Computing in Ruby at Ruby World Conf...
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Sameer Deshmukh
November 03, 2016
Programming
1
220
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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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
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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.
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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?