This is an IPython notebook backed by a Ruby kernel

In [1]:

    

puts 'Hello, world!'


    

    




Hello, world!

In [2]:

    

$stderr.puts 'Error!'


    

    




Error!

In [3]:

    

Math.sqrt(2)


    

    
Out[3]:





1.4142135623730951

In [4]:

    

File.open('lib/iruby/static/base/images/src/ruby.svg')


    

    
Out[4]:

In [5]:

    

File.open('lib/iruby/static/base/images/ipynblogo.png')


    

    
Out[5]:

In [6]:

    

IRuby.display '<b style="color:green">Hello, world!</b>', mime: 'text/html'


    

    
Out[6]:




Hello, world!

In [7]:

    

IRuby.html '<iframe src=http://en.mobile.wikipedia.org/?useformat=mobile width=700 height=350></iframe>'


    

    
Out[7]:

In [8]:

    

IRuby.display IRuby.latex <<-'TEX'
\begin{eqnarray}
\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} & = \frac{4\pi}{c}\vec{\mathbf{j}} \\
\nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} & = 0 
\end{eqnarray}
TEX

IRuby.math('F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx')


    

    
Out[8]:





\begin{eqnarray}
\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} & = \frac{4\pi}{c}\vec{\mathbf{j}} \\
\nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} & = 0 
\end{eqnarray}







    
Out[8]:





$$F(k) = \int_{-\infty}^{\infty} f(x) e^{2\pi i k} dx$$

In [9]:

    

IRuby.display IRuby.table([1,2,[],3])
IRuby.display IRuby.table({a:1,b:2,c:3})
IRuby.display IRuby.table([[11,12,13,14],[21,22,23],'not an Array',[31,32,33,34]])
IRuby.display IRuby.table({a:[11,12,13,14],b:[21,22,23],c:[31,32,33,34]})
IRuby.display IRuby.table([{a:1,b:2,c:3},'not an Array',{a:2,b:3,c:4,e:5}])
IRuby.display IRuby.table([{a:1,b:2,c:3},{a:2,b:3,c:4,d:5},{0=>:x,1=>:y},[:a,:b,:c]])


    

    
Out[9]:




1
2
3






    
Out[9]:




a
1
b
2
c
3






    
Out[9]:




11
12
13
14
21
22
23
not an Array
31
32
33
34






    
Out[9]:




a
11
12
13
14
b
21
22
23
c
31
32
33
34






    
Out[9]:




a
b
c
e
1
2
3
not an Array
2
3
4
5






    
Out[9]:




a
b
c
d
0
1
2
1
2
3
2
3
4
5
x
y
a
b
c

In [10]:

    

ls Array


    

    




Array.methods: []  try_convert
Array#methods: 
  &            count       include?            reject!               slice!    
  *            cycle       index               repeated_combination  sort      
  +            delete      insert              repeated_permutation  sort!     
  -            delete_at   inspect             replace               sort_by!  
  <<           delete_if   join                reverse               take      
  <=>          drop        keep_if             reverse!              take_while
  ==           drop_while  last                reverse_each          to_a      
  []           each        length              rindex                to_ary    
  []=          each_index  map                 rotate                to_s      
  assoc        empty?      map!                rotate!               transpose 
  at           eql?        pack                sample                uniq      
  bsearch      fetch       permutation         select                uniq!     
  clear        fill        pop                 select!               unshift   
  collect      find_index  pretty_print        shelljoin             values_at 
  collect!     first       pretty_print_cycle  shift                 zip       
  combination  flatten     product             shuffle               |         
  compact      flatten!    push                shuffle!            
  compact!     frozen?     rassoc              size                
  concat       hash        reject              slice               

In [11]:

    

require 'RMagick'

img = Magick::Image.new(240, 300)
gc = Magick::Draw.new
gc.fill('#FFAA00')

x = 120
y = 32.5
gc.polygon(x,    y,     x+29, y+86,  x+109, y+86,
           x+47, y+140, x+73, y+226, x,     y+175,
           x-73, y+226, x-47, y+140, x-109, y+86,
           x-29, y+86)

gc.draw(img)

img


    

    
Out[11]:

In [12]:

    

require 'gnuplot'

Gnuplot::Plot.new do |plot|  
    plot.xrange '[-0.5:0.5]'
    plot.title  'Example plot'
    plot.ylabel 'x'
    plot.xlabel 'sin(1/x)'
    plot.samples 10000
    plot.data << Gnuplot::DataSet.new('sin(1/x)') do |ds|
        ds.with = 'lines'
        ds.linewidth = 2
    end
end


    

    
Out[12]:

In [13]:

    

Gnuplot::SPlot.new do |plot|
    plot.title 'Spiral'
    plot.nokey
    plot.parametric
    plot.hidden3d
    plot.view '80,50'
    plot.isosamples '60,15'
    plot.xrange '[-8:8]'
    plot.yrange '[-8:8]'
    plot.zrange '[-8:8]'
    plot.urange '[-2*pi:2*pi]'
    plot.vrange '[-pi:pi]'
    plot.data << Gnuplot::DataSet.new('cos(u)*(cos(v)+3), sin(u)*(cos(v)+3), sin(v)+u') do |ds|
        ds.with = 'lines'
    end
end


    

    
Out[13]:

In [14]:

    

require 'rubyvis'
    
Rubyvis::Panel.new do 
  width 150
  height 150
  bar do
    data [1, 1.2, 1.7, 1.5, 0.7, 0.3]
    width 20
    height {|d| d * 80}
    bottom(0)
    left {index * 25}
  end
end


    

    
Out[14]:

In [15]:

    

require 'gruff'
g = Gruff::Line.new
g.title = 'Gruff Example'
g.data :Jimmy, [25, 36, 86, 39, 25, 31, 79, 88]
g.data :Charles, [80, 54, 67, 54, 68, 70, 90, 95]
g.data :Julie, [22, 29, 35, 38, 36, 40, 46, 57]
g.data :Jane, [95, 95, 95, 90, 85, 80, 88, 100]
g.data :Philip, [90, 34, 23, 12, 78, 89, 98, 88]
g.data :Arthur, [5, 10, 13, 11, 6, 16, 22, 32]
g


    

    
Out[15]:

In [16]:

    

require 'matrix'
Matrix[[1,2,3],[1,2,3]]


    

    
Out[16]:





$$\left(\begin{array}{ccc}
  1&2&3\\
  1&2&3\\
\end{array}\right)$$