Module: Properties

Includes:
MatrixErr
Included in:
Matrix
Defined in:
lib/matrix_gem/properties_module.rb

Instance Method Summary collapse

Instance Method Details

#col(index) ⇒ Object Also known as: column

Returns array with column on index as values. Also aliased as column()



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# File 'lib/matrix_gem/properties_module.rb', line 72

def col(index)
  column = []
  (0..self.m-1).each{ |x| column << self[x, index] }
  column
end

#col_length ⇒ Object Also known as: n, col_size

Returns the number of columns. Also aliased as n(), col_size(), column_count()



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# File 'lib/matrix_gem/properties_module.rb', line 44

def col_length
  self[0].length
end

#diagonal_values ⇒ Object

Return array with values on main diagonal.



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# File 'lib/matrix_gem/properties_module.rb', line 19

def diagonal_values
  size = ([self.m, self.n].min) -1
  values = []

  (0..size).each do |i|
    values << self[i][i]
  end
  values
end

#is_diagonal ⇒ Object Also known as: diagonal?

Returns true if there is values not equal to 0 only on main diagonal. Also aliased as diagonal?



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# File 'lib/matrix_gem/properties_module.rb', line 98

def is_diagonal
  (0..self.m-1).each do |i|
    (0..self.m-1).each do |j|
      return false if ((self[i,j] != 0 && i != j))
    end
  end
  true
end

#is_square ⇒ Object Also known as: square?

Returns true if this is a matrix with equal rows and columns. Also aliased as square?



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# File 'lib/matrix_gem/properties_module.rb', line 118

def is_square
  return false if self.m != self.n
  true
end

#orthogonal? ⇒ Boolean Also known as: is_orthogonal

Returns true if this is square matrix and its transpose is equal to its inverse. Also aliased as is_zero

Returns:

  • (Boolean) 


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# File 'lib/matrix_gem/properties_module.rb', line 126

def orthogonal?
  return true if ((self.is_square) && (self.transposed == self.inversed))
  false
end

#row(index) ⇒ Object

Retuns array with row on index as values.



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# File 'lib/matrix_gem/properties_module.rb', line 66

def row(index)
  self[index]
end

#row_length ⇒ Object Also known as: m, row_size

Returns the number of rows. Also aliased as m(), row_size(), row_count()



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# File 'lib/matrix_gem/properties_module.rb', line 50

def row_length
  i = 0
  self.each{ |row| i+=1 }
  i/self[0].length
end

#set_col(index, elements) ⇒ Object

Set values of matrix column. Elements shoud be an array of values. Raise error if length of elements is not equal to matrix column length.

Raises:



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# File 'lib/matrix_gem/properties_module.rb', line 90

def set_col(index, elements)
  raise MatrixArgumentError, 'Different length of elements and column length' if elements.length != self.col_length
  (0..self.m-1).each{ |x| self[x, index] = elements[x] }
  self
end

#set_diagonal(*nums) ⇒ Object Also known as: set_diagonal_values

Set values on main diagonal. Raise error if nums are less than matrix main diagonal length Also aliased as set_diagonal_values

Raises:



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# File 'lib/matrix_gem/properties_module.rb', line 32

def set_diagonal(*nums)
  size = ([self.m, self.n].min) -1
  raise MatrixArgumentError, 'Wrong number of arguments.' if nums.length < size + 1
  (0..size).each do |i|
    self[i,i] = nums[i]
  end
  self
end

#set_row(index, elements) ⇒ Object

Set values of matrix row. Elements shoud be an array of values Raise error if length of elements is not equal to matrix row length.

Raises:



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# File 'lib/matrix_gem/properties_module.rb', line 81

def set_row(index, elements)
  raise MatrixArgumentError, 'Different length of elements and row length' if
  elements.length != self.row_length
  self[index] = elements
  self
end

#to_a ⇒ Object

Returns an array of arrays that describe the rows of the matrix.



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# File 'lib/matrix_gem/properties_module.rb', line 6

def to_a
  self
end

#to_f ⇒ Object

Make all values floating point.



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# File 'lib/matrix_gem/properties_module.rb', line 11

def to_f
  (0..self.n - 1).each{ |i| (0..self.m - 1).each do
    |j| self[i,j] = self[i,j].to_f
    end }
  self
end

#zero? ⇒ Boolean Also known as: is_zero

Returns true if this is a matrix with only zero elements. Also aliased as is_zero

Returns:

  • (Boolean) 


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# File 'lib/matrix_gem/properties_module.rb', line 110

def zero?
  self.map{ |x| return false if x != 0 }
  true
end