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# dataset.rb : The implementation of data sets
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# Copyright (C) 2006 Vincent Fourmond
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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require 'MetaBuilder/metabuilder'
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# An abstract class representing a DataSet. You should consider using
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# a subclass, DataSet2D or DataSet3D. A DataSet must be either 2D or 3D,
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# and redefine #is_2D? and #is_3D? accordingly.
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# As DataSets grow more complex, it is likely that it will be less and
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# less easy to tweak directly the data inside. So, please, do use the
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# accessors and tweakers provided in the interface, else you'll expose
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# yourself to some intensive breakages when I get more clever.
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# Meanwhile, the apply(meth,where,*rest) method should be used to keep
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# everything in sync when you apply a method to a Dvector.
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# The #creation_context attribute is a hash containing a :backend key
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# indicating the name of the Backend created and filled with the
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# contents of the backend's DescriptionInclude#save_state function.
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attr_accessor :creation_context
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# The data of the set.
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# Errors on data, if applicable.
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# For 2D data, this will just be a hash with the following Dvectors:
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# :xmin, :xmax for errors on the x values + :x, to make sure
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# we keep it up-to-date.
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# :ymin, :ymax for errors on y + :y.
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# Both ?min and ?max have to be specified if any output should be
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# The metadata given when the set was created.
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attr_accessor :meta_data
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# A few forwarded stuff to make the DataSet behave exactly like
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# Function and it's future 3D counterpart
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def_delegators :@data, :x, :y, :z
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def initialize(backend, data, errors = {}, meta_data = {})
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@creation_context = backend.save_state
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@creation_context[:backend] = backend.description.name
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@meta_data = meta_data
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# Apply a Dvector operation to the given dimension, including
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# everything that could be left somewhere in the error bars.
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# It should be very powerful in the end.
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# Beautiful, isn't it ??
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def apply(what, where, *rest)
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self.send(where).send(what, *rest)
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for key,values in @errors
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if key.to_s =~ /^#{where}/ # Very much overkill, but, well...
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values.send(what,*rest)
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# Does a redirection to the underlying @data if that makes sense.
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def method_missing(sym, *args, &b)
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if @data.respond_to?(sym)
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@data.send(sym, *args, &b)
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elsif x.respond_to?(sym) # We are trying to apply something
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# like data.mul!(:x, factor)
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apply(sym,args.shift,*args,&b)
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# A 2-dimensionnal DataSet
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class DataSet2D < DataSet
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# A 3-dimensionnal DataSet
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class DataSet3D < DataSet
added
removed
Backends/lib/Backends/dataset.rb
