question: clear histogram data concode_field_sep Map<Double,ArrayList<TextHistogramData>> data concode_elem_sep double step concode_field_sep void add concode_elem_sep double getStep concode_elem_sep double getCategory concode_elem_sep String export concode_elem_sep void setStep
target: void function ( ) { this . data = new HashMap < Double , ArrayList < TextHistogramData >> ( ) ; }