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Contents
module SPCore
# Provide methods for generating sequences that scale linearly or exponentially.
class Scale
# Produce a sequence of values that progresses in a linear fashion.
# @param [Range] range The start and end values the set should include.
# @param [Fixnum] n_points The number of points to create for the sequence, including the start and end points.
# @raise [ArgumentError] if n_points is < 2.
def self.linear range, n_points
raise ArgumentError, "n_points is < 2" if n_points < 2
incr = (range.last - range.first) / (n_points - 1)
points = Array.new(n_points)
value = range.first
points.each_index do |i|
points[i] = value
value += incr
end
return points
end
# Produce a sequence of values that progresses in an exponential fashion.
# @param [Range] range The start and end values the set should include.
# @param [Fixnum] n_points The number of points to create for the sequence, including the start and end points.
# @raise [ArgumentError] if n_points is < 2.
def self.exponential range, n_points
raise ArgumentError, "n_points is < 2" if n_points < 2
multiplier = (range.last / range.first)**(1.0/(n_points-1))
points = Array.new(n_points)
value = range.first
points.each_index do |i|
points[i] = value
value *= multiplier
end
return points
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems