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Input/Output Functions

Reading the data in and building the item bitmaps. More...

Data Structures
class	InputData
	Class for reading transactions from an ASCII file. More...
class	ItemsetOutput
	Output itemsets to a file. More...
class	Transaction
	Transaction (itemlist) from a database. More...
Functions
void	AddToF1 (TreeNode *newNode)
	Insert pointer to node in order of increasing support.
void	F1UsingProb (double P)
	Create bitmaps filled randomly with probability p.
void	F1FromFile (char *filename, bool isAsciiFile)
	Read transaction data from file and build item bitmaps.
void	PrintMFI ()
	To print the MFI data out to an ASCII file with each entry having the format: [list of items in MFI entry...] [(support)].
	ItemsetOutput (char *filename)
	Open file for outputting itemsets.
	~ItemsetOutput ()
	Close file output stream.
int	isOpen ()
	Check if file is open.
void	printSet (int length, int *iset, int support=-1)
	Print out an itemset.
Transaction *	getNextTransaction ()
	Get next transaction from the input file.
	InputData (char *filename, int *ITEMBUFFER, bool IS_ASCII)
	Open the input file.
	~InputData ()
	Close the input file.
int	isOpen ()
	Check if the input file is open.

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Detailed Description

Reading the data in and building the item bitmaps.

Outputting the frequent itemsets.

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Function Documentation

void AddToF1 (  TreeNode *    newNode )

Insert pointer to node in order of increasing support. Parameters: newNode  item node to add to F1 Definition at line 200 of file Mafia.cpp. Referenced by F1FromFile(), and F1UsingProb().

void F1FromFile (  char *    filename, bool    isAsciiFile )

Read transaction data from file and build item bitmaps. If the data is in ascii form: [itemid_1] [itemid_2] ... [itemid_n] If the data is in binary form: [custid] [transid] [number of items] [itemid_1] [itemid_2] ... [itemid_n] Parameters: filename  name of file to be read in isAsciiFile  true for ASCII input, false for binary Definition at line 254 of file Mafia.cpp.

void F1UsingProb (  double    P )

Create bitmaps filled randomly with probability p. Parameters: P  - probability of a bit p being set Definition at line 224 of file Mafia.cpp.

Transaction * InputData::getNextTransaction (    )  [inherited]

Get next transaction from the input file. Returns: pointer to a new Transaction Definition at line 52 of file Transaction.cpp. Referenced by F1FromFile().

InputData::InputData (  char *    filename, int *    ITEMBUFFER, bool    IS_ASCII )  [inherited]

Open the input file. Parameters: filename  input filename ITEMBUFFER  pointer to buffer for storing a transaction IS_ASCII  true if file is in ASCII format Definition at line 123 of file Transaction.cpp.

int InputData::isOpen (    )  [inherited]

Check if the input file is open. Returns: true if file is open Definition at line 145 of file Transaction.cpp. Referenced by F1FromFile().

int ItemsetOutput::isOpen (    )  [inherited]

Check if file is open. Returns: true if file is open Definition at line 67 of file ItemsetOutput.cpp. Referenced by PrintMFI().

ItemsetOutput::ItemsetOutput (  char *    filename )  [inherited]

Open file for outputting itemsets. Parameters: filename  filename for output Definition at line 50 of file ItemsetOutput.cpp.

void PrintMFI (    )

To print the MFI data out to an ASCII file with each entry having the format: [list of items in MFI entry...] [(support)]. Definition at line 371 of file Mafia.cpp.

void ItemsetOutput::printSet (  int    length, int *    itemset, int    support = -1 )  [inherited]

Print out an itemset. Parameters: length  number of items in itemset itemset  array of items support  support of itemset (-1 to suppress) Definition at line 81 of file ItemsetOutput.cpp. Referenced by AddToFI(), and PrintMFI().

InputData::~InputData (    )  [inherited]

Close the input file. Definition at line 136 of file Transaction.cpp.

ItemsetOutput::~ItemsetOutput (    )  [inherited]

Close file output stream. Definition at line 57 of file ItemsetOutput.cpp.

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