class Hal4R::Matrix

# File lib/hal4r/matrix.rb, line 42
def initialize(step = nil)
  @matrix = matrix(@step = step || DEFAULT_STEP)
end

# File lib/hal4r/matrix.rb, line 60
def each_col(&block)
  block ? @matrix.each_col(&block) : enum_for(:each_col)
end

# File lib/hal4r/matrix.rb, line 48
def get(index)
  expand unless index < size
  @matrix.row(index)
end

# File lib/hal4r/matrix.rb, line 64
def inspect
  '#<%s:0x%x @step=%p, @size=%p>' % [
    self.class, object_id, step, size
  ]
end

# File lib/hal4r/matrix.rb, line 53
def vector(index, size = size(), norm = false)
  vector = @matrix.subrow(index, 0, size)
    .concat(@matrix.subcolumn(index, 0, size))

  Vector.new(norm ? vector.to_f.normalize : vector)
end

# File lib/hal4r/matrix.rb, line 72
def expand(new_size = size + step)
  @matrix = matrix(new_size).set(range = 0 .. size - 1, range, @matrix)
end

# File lib/hal4r/matrix.rb, line 76
def matrix(size)
  GSL::Matrix::Int.zeros(size)
end