Data processing method and data processing program

A data processing method for extracting a subset as a processing object from a tabular format data expressed as an array of records each including an item and an item value belonging to the item, comprising:

• a) a step of constructing the tabular format data by dividing it into information blocks each including a value list in which item values are stored in order of item value numbers corresponding to the item values belonging to a specific item and a pointer array in which pointer values to indicate the item value numbers are stored in order of unique record numbers;
• b) a step of creating, in response to selection of a subset as a part of the records, an ordered set array containing recording numbers of the subset;
• c) a step of arranging a pointer value in the pointer array at a position indicated by each of the record numbers of the ordered set into an item value number array correspondingly to the position where the record number is arranged;
• and
• e) a step of using the item value number array as a second value list and using the original value list as a second value list, and wherein
• a value in the value list is specified from a record number of the ordered set array through an element in the second pointer array at a position indicted by the record number and an element in the second value list at a position indicated by the element in the second pointer array.

A data processing program for operating a computer to extract a subset as a processing object from a tabular format data expressed as an array of records each including an item and an item value belonging to the item, the data processing program causing the computer to execute:

• a) a step of constructing the tabular format data by dividing it into information blocks each including a value list in which item values are stored in order of item value numbers corresponding to the item values belonging to a specific item and a pointer array in which pointer values to indicate the item value numbers are stored in order of unique record numbers;
• b) a step of creating, in response to selection of a subset as a part of the records, an ordered set array containing recording numbers of the subset;
• c) a step of arranging a pointer value in the pointer array at a position indicated by each of the record numbers of the ordered set into an item value number array correspondingly to the position where the record number is arranged;
• and
• d) a step of creating a second pointer array storing position elements and a second value list storing value elements by referring to the value in the item value number array, and wherein
• the computer is operated such that a value in the value list is specified from a record number of the ordered set array through an element in the second pointer array at a position indicted by the record number and an element in the second value list at a position indicated by the element in the second pointer array.

A data processing program for operating a computer to extract a subset as a processing object from a tabular format data expressed as an array of records each including an item and an item value belonging to the item, the data processing program causing the computer to execute:

• a) a step of constructing the tabular format data by dividing it into information blocks each including a value list in which item values are stored in order of item value numbers corresponding to the item values belonging to a specific item and a pointer array in which pointer values to indicate the item value numbers are stored in order of unique record numbers;
• b) a step of creating, in response to selection of a subset as a part of the records, an ordered set array containing recording numbers of the subset;
• c) a step of arranging a pointer value in the pointer array at a position indicated by each of the record numbers of the ordered set into an item value number array correspondingly to the position where the record number is arranged;
• and
• e) a step of using the item value number array as a second value list and using the original value list as a second value list, and wherein
• the computer is made to operated such that a value in the value list is specified from a record number of the ordered set array through an element in the second pointer array at a position indicted by the record number and an element in the second value list at a position indicated by the element in the second pointer array.