This notebook describes plots that can be drawn using Gruff in Daru.

Lets change the plotting library to Gruff.

require 'daru'
Daru.plotting_library = :gruff

:gruff

Line Graph

df = Daru::DataFrame.new({
  a: [1, 3, 5, 7, 5, 0],
  b: [1, 5, 2, 5, 1, 0],
  c: [1, 6, 7, 2, 6, 0]
  }, index: 'a'..'f')
df.plot type: :line

One can also select specific columns to display on x and y axis.

df.plot type: :line, x: :a, y: [:b, :c]

Scatter Plot

df.plot type: :scatter, x: :a, y: :b

Bar Graph

df.plot type: :bar

Categorical Data Visualization

Scatter plot can be differentiated by a category vector.

df = Daru::DataFrame.new({
  a: [1, 2, 3, 4, 5],
  b: [3, 2, 5, 1, 5],
  c: [:a, :a, :a, :b, :b]
  })
df.to_category :c

Daru::DataFrame(5x3)
	a	b	c
0	1	3	a
1	2	2	a
2	3	5	a
3	4	1	b
4	5	5	b

df.plot type: :scatter, x: :a, y: :b, categorized: {by: :c}