 	import weave.utils.ColumnUtils;
 	import weave.utils.Dictionary2D;
 	import weave.utils.EquationColumnLib;
+	import weave.utils.VectorUtils;
 	
 	/**
 	 * This is a column of data derived from an equation with variables.

				_lastError = str;
				reportError(e);
			}
		}

		/**
		 * This function will store an individual metadata value in the metadata linkable variable.

					}
				}
			}
			else if (propertyName == ColumnMetadata.KEY_TYPE)
			{
				var cols:Array = variables.getObjects(IAttributeColumn);
				if (cols.length)
					value = (cols[0] as IAttributeColumn).getMetadata(propertyName);
			}
			
			_cachedMetadata[propertyName] = value;
			return value;
		}
