FP-growth算法c语言实现
时间: 2024-01-02 17:02:13 浏览: 40
FP-growth算法的C语言实现可以参考以下代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// 定义FP树的节点结构
typedef struct FPNode {
char item; // 节点代表的项
int count; // 项出现的次数
struct FPNode *parent; // 父节点指针
struct FPNode *child; // 子节点指针
struct FPNode *sibling; // 兄弟节点指针
struct FPNode *next; // 下一个相同项的节点指针
} FPNode;
// 定义项头表项结构
typedef struct HeaderItem {
char item; // 项
int count; // 项出现的次数
struct FPNode *nodeLink; // 指向项的第一个节点指针
} HeaderItem;
// 构建项头表
void buildHeaderTable(char *transactions[], int numTransactions, HeaderItem *headerTable, int minSupport) {
int i, j;
for (i = 0; i < numTransactions; i++) {
char *transaction = transactions[i];
for (j = 0; j < strlen(transaction); j++) {
char item = transaction[j];
int k;
for (k = 0; k < minSupport; k++) {
if (headerTable[k].item == item) {
headerTable[k].count++;
break;
}
}
}
}
}
// 构建FP树
void buildFPTree(char *transactions[], int numTransactions, HeaderItem *headerTable, int minSupport, FPNode **root) {
int i, j;
for (i = 0; i < numTransactions; i++) {
char *transaction = transactions[i];
FPNode *currentNode = *root;
FPNode *parentNode = NULL;
for (j = 0; j < strlen(transaction); j++) {
char item = transaction[j];
FPNode *childNode = NULL;
while (1) {
if (currentNode->item == item) {
currentNode->count++;
break;
}
if (currentNode->sibling != NULL) {
currentNode = currentNode->sibling;
} else {
childNode = (FPNode*)malloc(sizeof(FPNode));
childNode->item = item;
childNode->count = 1;
childNode->parent = currentNode;
childNode->child = NULL;
childNode->sibling = NULL;
childNode->next = headerTable[item].nodeLink;
headerTable[item].nodeLink = childNode;
if (currentNode->child != NULL) {
currentNode = currentNode->child;
while (currentNode->sibling != NULL) {
currentNode = currentNode->sibling;
}
currentNode->sibling = childNode;
} else {
currentNode->child = childNode;
}
break;
}
}
currentNode = childNode;
}
}
}
// 打印FP树
void printFPTree(FPNode *node, int depth) {
int i;
for (i = 0; i < depth; i++) {
printf("\t");
}
printf("%c:%d\n", node->item, node->count);
FPNode *childNode = node->child;
while (childNode != NULL) {
printFPTree(childNode, depth + 1);
childNode = childNode->sibling;
}
}
// 主函数
int main() {
char *transactions[] = {"ABCE", "ACD", "ABDE", "ACDE", "ABCDE"};
int numTransactions = sizeof(transactions) / sizeof(transactions[0]);
int minSupport = 2;
// 构建项头表
HeaderItem headerTable[26] = {0};
buildHeaderTable(transactions, numTransactions, headerTable, minSupport);
// 构建FP树
FPNode *root = (FPNode*)malloc(sizeof(FPNode));
root->item = '\0';
root->count = 0;
root->parent = NULL;
root->child = NULL;
root->sibling = NULL;
root->next = NULL;
buildFPTree(transactions, numTransactions, headerTable, minSupport, &root);
// 打印FP树
printFPTree(root, 0);
return 0;
}
```
以上是一个简单的FP-growth算法的C语言实现。在主函数中,我们定义了一些样本事务,设置了最小支持度为2。然后通过调用`buildHeaderTable`和`buildFPTree`函数构建了项头表和FP树。最后,通过调用`printFPTree`函数打印了构建好的FP树。你可以根据自己的需求进行修改和扩展。