C# Instance.isMissing方法代码示例

		/// <summary> Convert a single instance over. The converted instance is 
		/// added to the end of the output queue.
		/// 
		/// </summary>
		/// <param name="instance">the instance to convert
		/// </param>
		private void  convertInstance(Instance instance)
		{
			
			Instance inst = null;
			if (instance is SparseInstance)
			{
				double[] vals = new double[instance.numValues()];
				int[] indices = new int[instance.numValues()];
				int num = 0;
				for (int j = 0; j < instance.numValues(); j++)
				{
					if (instance.isMissingSparse(j) && (getInputFormat().classIndex() != instance.index(j)) && (instance.attributeSparse(j).Nominal || instance.attributeSparse(j).Numeric))
					{
						if (m_ModesAndMeans[instance.index(j)] != 0.0)
						{
							vals[num] = m_ModesAndMeans[instance.index(j)];
							indices[num] = instance.index(j);
							num++;
						}
					}
					else
					{
						vals[num] = instance.valueSparse(j);
						indices[num] = instance.index(j);
						num++;
					}
				}
				if (num == instance.numValues())
				{
					inst = new SparseInstance(instance.weight(), vals, indices, instance.numAttributes());
				}
				else
				{
					double[] tempVals = new double[num];
					int[] tempInd = new int[num];
					Array.Copy(vals, 0, tempVals, 0, num);
					Array.Copy(indices, 0, tempInd, 0, num);
					inst = new SparseInstance(instance.weight(), tempVals, tempInd, instance.numAttributes());
				}
			}
			else
			{
				double[] vals = new double[getInputFormat().numAttributes()];
				for (int j = 0; j < instance.numAttributes(); j++)
				{
					if (instance.isMissing(j) && (getInputFormat().classIndex() != j) && (getInputFormat().attribute(j).Nominal || getInputFormat().attribute(j).Numeric))
					{
						vals[j] = m_ModesAndMeans[j];
					}
					else
					{
						vals[j] = instance.value_Renamed(j);
					}
				}
				inst = new Instance(instance.weight(), vals);
			}
			inst.Dataset = instance.dataset();
			push(inst);
		}

		/// <summary> Convert a single instance over if the class is nominal. The converted 
		/// instance is added to the end of the output queue.
		/// 
		/// </summary>
		/// <param name="instance">the instance to convert
		/// </param>
		private void  convertInstance(Instance instance)
		{
			
			double[] vals = new double[outputFormatPeek().numAttributes()];
			int attSoFar = 0;
			
			for (int j = 0; j < getInputFormat().numAttributes(); j++)
			{
                weka.core.Attribute att = getInputFormat().attribute(j);
				if (!att.Nominal || (j == getInputFormat().classIndex()) || !m_Columns.isInRange(j))
				{
					vals[attSoFar] = instance.value_Renamed(j);
					attSoFar++;
				}
				else
				{
					if (att.numValues() <= 2)
					{
						vals[attSoFar] = instance.value_Renamed(j);
						attSoFar++;
					}
					else
					{
						if (instance.isMissing(j))
						{
							for (int k = 0; k < att.numValues(); k++)
							{
								vals[attSoFar + k] = instance.value_Renamed(j);
							}
						}
						else
						{
							for (int k = 0; k < att.numValues(); k++)
							{
								//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
								if (k == (int) instance.value_Renamed(j))
								{
									vals[attSoFar + k] = 1;
								}
								else
								{
									vals[attSoFar + k] = 0;
								}
							}
						}
						attSoFar += att.numValues();
					}
				}
			}
			Instance inst = null;
			if (instance is SparseInstance)
			{
				inst = new SparseInstance(instance.weight(), vals);
			}
			else
			{
				inst = new Instance(instance.weight(), vals);
			}
			copyStringValues(inst, false, instance.dataset(), InputStringIndex, getOutputFormat(), OutputStringIndex);
			inst.Dataset = getOutputFormat();
			push(inst);
		}

		/// <summary> Returns index of subset instance is assigned to.
		/// Returns -1 if instance is assigned to more than one subset.
		/// 
		/// </summary>
		/// <exception cref="Exception">if something goes wrong
		/// </exception>
		public override int whichSubset(Instance instance)
		{
			
			if (instance.isMissing(m_attIndex))
				return - 1;
			else
			{
				if (instance.attribute(m_attIndex).Nominal)
				{
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					return (int) instance.value_Renamed(m_attIndex);
				}
				else if (Utils.smOrEq(instance.value_Renamed(m_attIndex), m_splitPoint))
					return 0;
				else
					return 1;
			}
		}

		/// <summary> Returns weights if instance is assigned to more than one subset.
		/// Returns null if instance is only assigned to one subset.
		/// </summary>
		public override double[] GetWeights(Instance instance)
		{
			
			double[] weights;
			int i;
			
			if (instance.isMissing(m_attIndex))
			{
				weights = new double[m_numSubsets];
				for (i = 0; i < m_numSubsets; i++)
					weights[i] = m_distribution.perBag(i) / m_distribution.total();
				return weights;
			}
			else
			{
				return null;
			}
		}

		/// <summary> Checks if the given instance is compatible
		/// with this dataset. Only looks at the size of
		/// the instance and the ranges of the values for 
		/// nominal and string attributes.
		/// 
		/// </summary>
		/// <returns> true if the instance is compatible with the dataset 
		/// </returns>
		public virtual bool checkInstance(Instance instance)
		{
			
			if (instance.numAttributes() != numAttributes())
			{
				return false;
			}
			for (int i = 0; i < numAttributes(); i++)
			{
				if (instance.isMissing(i))
				{
					continue;
				}
				else if (attribute(i).Nominal || attribute(i).String)
				{
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					if (!(Utils.eq(instance.value_Renamed(i), (double) instance.value_Renamed(i))))
					{
						return false;
					}
					else if (Utils.sm(instance.value_Renamed(i), 0) || Utils.gr(instance.value_Renamed(i), attribute(i).numValues()))
					{
						return false;
					}
				}
			}
			return true;
		}

		/// <summary> Returns the subset an instance falls into.</summary>
		private int whichSubset(Instance instance)
		{
			
			if (instance.isMissing(m_AttIndex))
			{
				return 2;
			}
			else if (instance.attribute(m_AttIndex).Nominal)
			{
				//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
				if ((int) instance.value_Renamed(m_AttIndex) == m_SplitPoint)
				{
					return 0;
				}
				else
				{
					return 1;
				}
			}
			else
			{
				if (instance.value_Renamed(m_AttIndex) <= m_SplitPoint)
				{
					return 0;
				}
				else
				{
					return 1;
				}
			}
		}