donut.rb

require 'matplotlib/pyplot'
require 'matplotlib/axes_3d'
require 'numpy'

plt = Matplotlib::Pyplot
fig = plt.figure(num: 1, clear: true)

ax = fig.add_subplot(1, 1, 1, projection: '3d')

(theta, phi) = Numpy.meshgrid(Numpy.linspace(0, 2 * Numpy.pi, 41),
                              Numpy.linspace(0, 2 * Numpy.pi, 41))

x = (3 + Numpy.cos(phi)) * Numpy.cos(theta)
y = (3 + Numpy.cos(phi)) * Numpy.sin(theta)
z = Numpy.sin(phi)

def fun(t, f)
  (Numpy.cos(f + 2 * t) + 1) / 2.0
end

ax.plot_surface(x, y, z, facecolors: Matplotlib.cm.jet(fun(theta, phi)))

ax.set(xlabel: 'x',
       ylabel: 'y',
       zlabel: 'z',
       xlim: [-4, 4],
       ylim: [-4, 4],
       zlim: [-4, 4],
       xticks: [-4, -2, 2, 4],
       yticks: [-4, -2, 2, 4],
       zticks: [-1, 0, 1],
       title: 'Donut!')

fig.tight_layout()

plt.show()

fancy_donut.svg

Gemfile

# frozen_string_literal: true

source "https://rubygems.org"

git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }

gem 'matplotlib'
gem 'numpy'

wireframe.rb

require 'matplotlib/pyplot'
require 'matplotlib/axes_3d'
require 'numpy'

plt = Matplotlib::Pyplot

fig = plt.figure()
wf = fig.add_subplot(111, projection: '3d')

measured_results = []

(1..10).each do |with_in_chars|
  measured_results.push []

  (1..20).each do |cnt_words|
    measured_results[-1].push  with_in_chars + cnt_words + rand(5)
  end
end


xr = (1..10).to_a
yr = (1..20).to_a
zi = []

xi, yi = Numpy.meshgrid(xr, yr)



(0...xi.to_a.size).each do |row|
  zi.push []

  (0...xi[row].size).each do |col|

    x = xi[row][col] - 1
    y = yi[row][col] - 1

    zi[-1].push measured_results[x][y]
  end
end


x = Numpy.asarray xi
y = Numpy.asarray yi
z = Numpy.asarray zi

wf.plot_wireframe(x, y, z, rstride: 2,
                  cstride: 2, color: 'green')

wf.set_title('Example')

plt.savefig('wireframe.svg')

wireframe.svg

Explanations: https://medium.com/@dieter.s/visualizations-with-ruby-cdc16c0cee2e