Class ReplaceMissingValues

    • Constructor Detail

      • ReplaceMissingValues

        public ReplaceMissingValues()
    • Method Detail

      • globalInfo

        public java.lang.String globalInfo()
        Returns a string describing this filter
        Returns:
        a description of the filter suitable for displaying in the explorer/experimenter gui
      • setInputFormat

        public boolean setInputFormat​(Instances instanceInfo)
                               throws java.lang.Exception
        Sets the format of the input instances.
        Overrides:
        setInputFormat in class PotentialClassIgnorer
        Parameters:
        instanceInfo - an Instances object containing the input instance structure (any instances contained in the object are ignored - only the structure is required).
        Returns:
        true if the outputFormat may be collected immediately
        Throws:
        java.lang.Exception - if the input format can't be set successfully
      • input

        public boolean input​(Instance instance)
        Input an instance for filtering. Filter requires all training instances be read before producing output.
        Overrides:
        input in class Filter
        Parameters:
        instance - the input instance
        Returns:
        true if the filtered instance may now be collected with output().
        Throws:
        java.lang.IllegalStateException - if no input format has been set.
      • batchFinished

        public boolean batchFinished()
        Signify that this batch of input to the filter is finished. If the filter requires all instances prior to filtering, output() may now be called to retrieve the filtered instances.
        Overrides:
        batchFinished in class Filter
        Returns:
        true if there are instances pending output
        Throws:
        java.lang.IllegalStateException - if no input structure has been defined
      • toSource

        public java.lang.String toSource​(java.lang.String className,
                                         Instances data)
                                  throws java.lang.Exception
        Returns a string that describes the filter as source. The filter will be contained in a class with the given name (there may be auxiliary classes), and will contain two methods with these signatures:
        
         // converts one row
         public static Object[] filter(Object[] i);
         // converts a full dataset (first dimension is row index)
         public static Object[][] filter(Object[][] i);
         
        where the array i contains elements that are either Double, String, with missing values represented as null. The generated code is public domain and comes with no warranty.
        Specified by:
        toSource in interface Sourcable
        Parameters:
        className - the name that should be given to the source class.
        data - the dataset used for initializing the filter
        Returns:
        the object source described by a string
        Throws:
        java.lang.Exception - if the source can't be computed
      • main

        public static void main​(java.lang.String[] argv)
        Main method for testing this class.
        Parameters:
        argv - should contain arguments to the filter: use -h for help