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1、精選優(yōu)質(zhì)文檔-傾情為你奉上LAB4 實(shí)驗(yàn)報(bào)告實(shí)驗(yàn)?zāi)康模?.矩陣相乘實(shí)驗(yàn)內(nèi)容：給定兩個(gè)矩陣A和B，其中A是具有M行、K列的矩陣，B為K行、N列矩陣，A和B的矩陣積為C，C為M行，N列。矩陣C中第i行、第j列的元素Ci,j就是矩陣A第i行每個(gè)元素和矩陣B第j列每個(gè)元素乘積的和。本實(shí)驗(yàn)的目的是通過(guò)對(duì)矩陣乘法是多線程實(shí)現(xiàn)，讓學(xué)生加深對(duì)線程的理解與調(diào)用。實(shí)驗(yàn)步驟：在Linux操作系統(tǒng)上，利用Linux處理多線程的優(yōu)點(diǎn)，編寫(xiě)程序用多線程實(shí)現(xiàn)矩陣乘法。實(shí)現(xiàn)A、B兩個(gè)矩陣的乘法，并輸出計(jì)算結(jié)果。實(shí)驗(yàn)代碼如下：#include <stdio.h>#include <time.h>#inc

2、lude <pthread.h>#include <stdlib.h>#include <unistd.h>#include <memory.h>#define RANGE 100#define M 2#define K 2#define N 2void gene_matrix();void read_matrix();int matrixAMN=1,1,2,2;int matrixBNM=4,14,5,25;int arrMMN;int resMN=0;void *func(void *arg);main()clock_t start=cloc

3、k();int i,j,k,cnt,cnt2;pthread_t tidsN;for(i=0;i<N;i+)if(pthread_create(&tidsi,NULL,func,(void *)&i)perror("pthread_create");exit(1);pthread_join(tidsi,NULL);for(i=0;i<N;i+)pthread_join(tidsi,NULL);for(i=0;i<M;i+) for(j=0;j<M;j+)for(k=0;k<N;k+)resij+=arrijk; printf(&

4、quot;res%d%d=%dn",i,j,resij);clock_t finish=clock();printf("n",(long)(finish-start)/1E6);void *func(void *arg)int k=*(int *)arg;int i,j;printf("Enter funcn");for(i=0;i<M;i+) for(j=0;j<N;j+) arrijk=matrixAik*matrixBkj; printf("func=%dn", arrijk); pthread_exit(

5、NULL);void gene_matrix() FILE *file1,*file2; if(file1=fopen("/home/timelong/Desktop/matrixA","wt")=NULL) perror("fopen"); exit(1); if(file2=fopen("/home/timelong/Desktop/matrixB","wt")=NULL) perror("fopen"); exit(1); int i,j; srand(unsigned

6、)time(NULL); for(i=0;i<M;i+) for(j=0;j<N;j+) fprintf(file1,"%-8d",rand()%RANGE); fprintf(file1,"n"); fclose(file1); for(i=0;i<N;i+) for(j=0;j<M;j+) fprintf(file2,"%-8d",rand()%RANGE); fprintf(file2,"n"); fclose(file2); void read_matrix() FILE *file

7、1,*file2; if(file1=fopen("/home/timelong/Desktop/matrixA","rt")=NULL) perror("fopen"); exit(1); if(file2=fopen("/home/timelong/Desktop/matrixB","rt")=NULL) perror("fopen"); exit(1); int i,j; for(i=0;i<M;i+) for(j=0;j<N;j+) fscanf(file

8、1,"%d",&matrixAij); printf("matrixA%d%d=%dn",matrixAij); fclose(file1); for(i=0;i<N;i+) for(j=0;j<M;j+) fscanf(file2,"%d",&matrixBij); printf("matrixB%d%d=%dn",matrixBij); fclose(file2);編譯代碼：gcc -O2 -Wall -omyMartix myMartix.c -pthread運(yùn)行程序：專(zhuān)心-專(zhuān)注-專(zhuān)業(yè)