Class: SciYAG::Backends::MathBackend

Inherits:
Backend
  • Object
show all
Includes:
Dobjects, Math
Defined in:
lib/SciYAG/Backends/math.rb

Instance Method Summary collapse

Methods inherited from Backend

#base_line=, #clear_xy_filters, default_state, describe, #expand_sets, #get_cached_entry, #has_set?, list_backends, list_descriptions, logger=, #meta_data, #pop_xy_filter, #push_xy_filter, #set_type, #sets_available, #xy_data, #xyz_data

Methods included from MetaBuilder::DescriptionExtend

#base_description, #create_factory, #describe, #description, #factory_class, #factory_description, #factory_description_hash, #factory_description_list, #group, #has_factory?, #inherit_parameters, #param, #param_accessor, #param_reader, #param_writer, #register_class, #set_description

Methods included from MetaBuilder::DescriptionInclude

#description, #get_param, #get_param_raw, #long_name, #option_parser_banner, #option_parser_fill, #option_parser_options, #parameter, #restore_state, #save_state, #set_param, #set_param_raw

Constructor Details

#initialize ⇒ MathBackend

Returns a new instance of MathBackend.



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# File 'lib/SciYAG/Backends/math.rb', line 47

def initialize
  super()
  @samples = 100
  @x_range = -10.0..10.0
  @t_range = -10.0..10.0
  @log = false
end

Instance Method Details

#get_data(set) ⇒ Object 



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# File 'lib/SciYAG/Backends/math.rb', line 67

def get_data(set)
  # Parametric plot with a : in the middle
  if set =~ /:/
    x_block, y_block = set.split(/:/).map { |s|
      eval "proc {|t| #{s}}"
    }

    t_v = make_dvector(@t_range, @samples)
    x_v = t_v.collect(&x_block)
    y_v = t_v.collect(&y_block)
  else
    y_block = eval "proc {|x| #{set} }"
    x_v = make_dvector(@x_range, @samples)
    y_v = x_v.collect(&y_block)
  end
  return [x_v,y_v]
end

#make_dvector(range, nb_points, log = @log) ⇒ Object

Turns a Range and a number of points into a Dvector



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# File 'lib/SciYAG/Backends/math.rb', line 86

def make_dvector(range, nb_points, log = @log)
  n = nb_points -1
  a = Dvector.new(nb_points) { |i| 
    i.to_f/(n.to_f)
  }
  # a is in [0:1] inclusive...
  if log
    delta = range.last/range.first
    # delta is positive necessarily
    a *= delta.log
    a.exp!
    a *= range.first
  else
    delta = range.last - range.first
    a *= delta
    a += range.first
  end
  return a
end

#query_xy_data(set) ⇒ Object

This is called by the architecture to get the data. It splits the set name into func@range, reads the file if necessary and calls get_data.



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# File 'lib/SciYAG/Backends/math.rb', line 58

def query_xy_data(set)
  if set =~ /(.*)@(.*)/
    @x_range = ParamRange.new($2)
    set = $1
  end
  return Function.new(*get_data(set))
end