# Nyaplot Tutorial 4: Introduction of charts bundled with Nyaplot¶

Various types of diagrams are bundled with Nyaplot, but the usage is not so different. This notebook introduce a part of them.

In [1]:
gem 'nyaplot', '0.1.5'
require 'nyaplot'

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Out[1]:
true

## Bar chart¶

In [2]:
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

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## Line chart¶

In [3]:
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.show

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## Scatter¶

In [4]:
sc_y=[]; line_x=sc_x=[]; line_y=[]; a=0.5; b=3; noise=1.5; x=0
rnd = Random.new
while x<10
line_x.push(x)
line_y.push(a*x+b)
sc_y.push(a*x+b+noise*(rnd.rand-0.5))
x=(x+0.5).round(1)
end
plot2 = Nyaplot::Plot.new
sc.color('#000')
sc.title('point')
line.title('line')
plot2.legend(true)
plot2.show

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In [5]:
sc.shape(["triangle-up"])
sc.color('#fff')
plot2.show

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## Histogram¶

In [6]:
require 'distribution'
rng = Distribution::Normal.rng
arr = []
1000.times {arr.push(rng.call)}
plot3 = Nyaplot::Plot.new
plot3.yrange([0,300])
plot3.show

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## Box plot¶

In [7]:
arr2 = arr.map{|val| val/0.8-2}
arr3 = arr.map{|val| val*1.1+0.3}
arr4 = arr.map{|val| val*1.3+0.3}
""

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""
In [8]:
plot4 = Nyaplot::Plot.new
plot4.show

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## 2D Histogram¶

In [10]:
x=[]; y=[]; fill=[]
-5.step(5, 0.2) do |i|
-5.step(5, 0.2) do |j|
x.push(i)
y.push(j)
val = Math.sin(Math.sqrt(i*i+j*j))/Math.sqrt(i*i+j*j)
fill.push((val.nan? ? 0 : val))
end
end

plot5 = Nyaplot::Plot.new
hm = plot5.add(:heatmap, x, y, fill)
hm.stroke_color("#fff")
hm.stroke_width("0")
hm.width(0.2)
hm.height(0.2)
plot5.legend(true)
plot5.show

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