Class: LinearGraph

Inherits:
Object
  • Object
show all
Defined in:
lib/linear_graph.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(slope, y_int) ⇒ LinearGraph 



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# File 'lib/linear_graph.rb', line 50

def initialize(slope, y_int)
      @slope, @y_intercept = slope, y_int
end

Instance Attribute Details

#slope ⇒ Integer (readonly) Also known as: m 



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# File 'lib/linear_graph.rb', line 44

def slope
  @slope
end

#y_intercept ⇒ Object (readonly) Also known as: b

Returns the value of attribute y_intercept.



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# File 'lib/linear_graph.rb', line 47

def y_intercept
  @y_intercept
end

Class Method Details

.borders=(bool) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/linear_graph.rb', line 38

def self.borders=(bool)
  raise ArgumentError, "Argument must be true or false" unless bool == true | false
  @@borders = bool
end

.has_borders? ⇒ Boolean 



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# File 'lib/linear_graph.rb', line 23

def self.has_borders?
      @@borders
end

.x_axis ⇒ Object 



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# File 'lib/linear_graph.rb', line 5

def self.x_axis
        (0..(@@x_axis)).to_a
end

.x_axis=(num) ⇒ Object 



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# File 'lib/linear_graph.rb', line 9

def self.x_axis=(num)
      caa(num)
      @@x_axis = num
end

.y_axis ⇒ Object 



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# File 'lib/linear_graph.rb', line 14

def self.y_axis
  (0..(@@y_axis)).to_a
end

.y_axis=(num) ⇒ Object 



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# File 'lib/linear_graph.rb', line 18

def self.y_axis=(num)
  caa num
  @@y_axis = num
end

Instance Method Details

#domain ⇒ Array<Integer> 



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# File 'lib/linear_graph.rb', line 76

def domain # @return [Array<Integer>] the values of the xy hash

  xy.values
end

#f(x) ⇒ Object 



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# File 'lib/linear_graph.rb', line 99

def f(x)
  @slope * x + @y_intercept
end

#graph ⇒ Object 



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# File 'lib/linear_graph.rb', line 26

def graph
    y = -1
  graph = Array.new(@@y_axis) do
    y += 1
    x = -1
    Array.new(@@x_axis) do
      x += 1
      format_pair x, y
    end
  end
end

#range ⇒ Array<Integer> 



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# File 'lib/linear_graph.rb', line 80

def range # @return [Array<Integer>] the keys of the xy hash

  xy.keys
end

#to_s ⇒ String

Displays graph



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# File 'lib/linear_graph.rb', line 88

def to_s
  result = String.new
  for y_index in graph.reverse
    for x_index in y_index
      result << x_index
    end
    result << ?\n
  end
  return result.center 80
end

#x_intercept ⇒ Object Also known as: x_int, zero, solution 



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# File 'lib/linear_graph.rb', line 54

def x_intercept
  f(0)
end

#xy ⇒ Hash

Note:

There are no floats

The XY table



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# File 'lib/linear_graph.rb', line 66

def xy
  table = Hash.new
  for y in LinearGraph.y_axis
    for x in LinearGraph.x_axis
      table[y] = x if f(x) == y
    end
  end
  return table
end