puts 'hoge'

10.times do |i|
  puts i
end

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')

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

ls Array

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

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

require 'gruff'
g = Gruff::Line.new
g.font = "/Library/Fonts/Osaka.ttf"
g.title = 'グラフ例'
g.data '大阪', [25, 36, 86, 39, 25, 31, 79, 88]
g.data '京都', [80, 54, 67, 54, 68, 70, 90, 95]
g.data '名古屋', [22, 29, 35, 38, 36, 40, 46, 57]
g.data '東京', [95, 95, 95, 90, 85, 80, 88, 100]
g.data 'さいたま', [90, 34, 23, 12, 78, 89, 98, 88]
g.data '群馬', [5, 10, 13, 11, 6, 16, 22, 32]
g

require 'gnuplot'
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

require 'nyaplot'
require 'nyaplot3d'

x=[];y=[];z=[]
-10.step(10, 0.5) do |i|
  -10.step(10, 0.5) do |j|
    x.push(i)
    y.push(j)
    z.push(Math.sin(Math.sqrt(i*i+j*j))/Math.sqrt(i*i+j*j))
  end
end
z.map!{|val| next (val.nan? ? 0 : val)} #(0,0) will be -inf

plot = Nyaplot::Plot3D.new
plot.add(:wireframe, x, y, z)
plot.show

plot = Nyaplot::Plot.new
plot.add(:bar, ['Persian', 'Maine Coon', 'American Shorthair'], [10,20,30])
plot.x_label("Species")
plot.y_label("Number")
plot.show

x = []; y = []; theta = 0.6; a=1
while theta < 14*Math::PI do
  x.push(a*Math::cos(theta)/theta)
  y.push(a*Math::sin(theta)/theta)
  theta += 0.1
end
plot1 = Nyaplot::Plot.new
plot1.add(:line, x, y)
plot1.show