Module: NumRu::Misc::MD_Iterators

Included in:
NArray
Defined in:
lib/numru/misc/md_iterators.rb

Instance Method Summary collapse

Instance Method Details

#each_subary_at_dims(*dims) ⇒ Object 



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# File 'lib/numru/misc/md_iterators.rb', line 88

def each_subary_at_dims( *dims )
	if dims.min<0 || dims.max>=rank
	  raise ArguemntError,"Invalid dims #{dims.inspect} for #{rank}D array"
	end

	loopdims = Array.new
	sh = Array.new
	len = 1
	(0...rank).each{|i| 
	  if !dims.include?(i)
	    loopdims.push(i) 
	    sh.push(shape[i])
	    len *= shape[i]
	  end
	}
	if loopdims.length == 0
	  yield(self)
	  return self
	end
	cs = [1]
	(1...sh.length).each{|i| cs[i] = sh[i-1]*cs[i-1]}
	idx = Array.new
	all = 0..-1
	for i in 0...len do
	  loopdims.each_with_index{|d,j| idx[d] = ( (i/cs[j])%sh[j] )}
	  dims.each{|d| idx[d] = all}
	  sub = self[ *idx ]
	  yield(sub)
	end
	self
end

#each_subary_at_dims_with_index(*dims) ⇒ Object 



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# File 'lib/numru/misc/md_iterators.rb', line 120

def each_subary_at_dims_with_index( *dims )
	if dims.min<0 || dims.max>=rank
	  raise ArguemntError,"Invalid dims #{dims.inspect} for #{rank}D array"
	end

	loopdims = Array.new
	sh = Array.new
	len = 1
	(0...rank).each{|i| 
	  if !dims.include?(i)
	    loopdims.push(i) 
	    sh.push(shape[i])
	    len *= shape[i]
	  end
	}
	if loopdims.length == 0
	  yield(self, false)
	  return self
	end
	cs = [1]
	(1...sh.length).each{|i| cs[i] = sh[i-1]*cs[i-1]}
	idx = Array.new
	all = 0..-1
	for i in 0...len do
	  loopdims.each_with_index{|d,j| idx[d] = ( (i/cs[j])%sh[j] )}
	  dims.each{|d| idx[d] = all}
	  sub = self[ *idx ]
	  yield(sub, idx)
	end
	self
end