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Description: 用Doolittle方法求解此方程组；
1．先由U[1][i]=a[1][i] 求的U的第一行，在根据L[i][1]=a[i][1]/U[1][1] 求的L的第一列；2..然后根据公式求得U，L其他的值；
3 回带求解得到X
-Try using this method to solve equations; 1. First U [1] [i] = a [1] [i] for the U in the first line, in accordance with L [i] [1] = a [i] [1] / U [1] [1] L for the first out; 2 .. according to equation U, L other values; three to be solved with X
Platform: |
Size: 28288 |
Author: 崔青 |
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Description: Digital plus Analog-Designed to run perfectly on TC 3.0.Resolution 640 x 480 x16Colors.This particular program is designed to give U the current Date & Time in a graphical enviorenment.It is not only a clock but it shows U the Day,Date N Year too in a Graphically designed manner.The later versions may include skinnable clocks which will definately improve programming capabilities.
Platform: |
Size: 32718 |
Author: 王逸翔 |
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Description: 一个判断远程主机存活程序代码(ping)
#include
#include
#include
#include
#include "winsock.h"
#pragma comment(lib,"Ws2_32");
#define SEND_SIZE 32
#define PACKET_SIZE 4096
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
struct icmp
{
unsigned char icmp_type;
unsigned char icmp_code;
unsigned short icmp_cksum;
unsigned short icmp_id;
unsigned short icmp_seq;
unsigned long icmp_data;
};
struct ip
{
unsigned char ip_hl:4;
unsigned char ip_v:4;
unsigned char ip_tos;
unsigned short ip_len;
unsigned short ip_id;
unsigned short ip_off;
unsigned char ip_ttl;
unsigned char ip_p;
unsigned short ip_sum;
unsigned long ip_src;
unsigned long ip_dst;
};
unsigned char sendpacket[PACKET_SIZE];
unsigned char recvpacket[PACKET_SIZE];
struct sockaddr_in dest_addr;
struct sockaddr_in from_addr;
int sockfd;
int pid;
unsigned short cal_chksum(unsigned short *addr,int len);
int pack(int pack_no);
int unpack(unsigned char *buf,int len);
void send_packet(void);
void recv_packet(void);
void main(int argc,char *argv[])
{
struct hostent *host;
struct protoent *protocol;
WSADATA wsaData;
int timeout=1000;
int SEND_COUNT=4;
int i;
char *par_host;
par_host=argv[argc-1]; //IP赋值
switch(argc)
{
case 2: break;
case 3: if(strcmp(argv[1],"-t")==0)
{
SEND_COUNT=10000;
break;
}
//fall through
default:
printf("usage: %s [-t] Host name or IP address\n",argv[0]);
exit(1);
}
if(WSAStartup(0x1010,&wsaData)!=0)
{
printf("wsastartup error\n");
exit(1);
}
if( (protocol=getprotobyname("icmp") )==NULL)
{
printf("getprotobyname error\n");
exit(1);
}
/*
printf("%s\n",protocol->p_name);
printf("%s\n",protocol->p_aliases);
printf("%d\n",protocol->p_proto);
system("pause");
*/
if( (sockfd=socket(AF_INET,SOCK_RAW,protocol->p_proto) )<0)
{
printf("socket error\n");
exit(1);
}
if(setsockopt(sockfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout))h_length);
//resolve address to hostname
if(host=gethostbyaddr(host->h_addr,4,PF_INET))
par_host=host->h_name;
//
//printf("%s\n",par_host);
//
}
else if( dest_addr.sin_addr.s_addr=inet_addr(par_host)==INADDR_NONE)
{
printf("Unkown host %s\n",par_host);
exit(1);
}
pid=getpid();
/*
printf("%d\n",pid);
system("pause");
*/
printf("Pinging %s [%s]: with %d bytes of data:\n\n",par_host,inet_ntoa(dest_addr.sin_addr),SEND_SIZE);
for(i=0;i1)
{ sum+=*w++;
nleft-=2;
}
if( nleft==1)
{ *(unsigned char *)(&answer)=*(unsigned char *)w;
sum+=answer;
}
sum=(sum>>16)+(sum&0xffff);
sum+=(sum>>16);
answer=~sum;
return answer;
}
//打包
int pack(int pack_no)
{
int packsize;
struct icmp *icmp;
packsize=8+SEND_SIZE;
icmp=(struct icmp*)sendpacket;
icmp->icmp_type=ICMP_ECHO;
icmp->icmp_code=0;
icmp->icmp_cksum=0;
icmp->icmp_seq=pack_no;
icmp->icmp_id=pid;
icmp->icmp_data=GetTickCount();
icmp->icmp_cksum=cal_chksum( (unsigned short *)icmp,packsize); /*校验算法*/
return packsize;
}
//解包
int unpack(unsigned char *buf,int len)
{
struct ip *ip;
struct icmp *icmp;
double rtt;
int iphdrlen;
ip=(struct ip *)buf;
iphdrlen=ip->ip_hl*4;
icmp=(struct icmp *)(buf+iphdrlen);
if( (icmp->icmp_type==ICMP_ECHOREPLY) && (icmp->icmp_id==pid) )
{
len=len-iphdrlen-8;
rtt=GetTickCount()-icmp->icmp_data;
printf("Reply from %s: bytes=%d time=%.0fms TTL=%d icmp_seq=%u\n",
inet_ntoa(from_addr.sin_addr),
len,
rtt,
ip->ip_ttl,
icmp->icmp_seq);
return 1;
}
return 0;
}
//发送
void send_packet()
{
int packetsize;
static int pack_no=0;
packetsize=pack(pack_no++);
if( sendto(sockfd,(char *)sendpacket,packetsize,0,(struct sockaddr *)&dest_addr,sizeof(dest_addr) )=0)
success=unpack(recvpacket,n);
else if (WSAGetLastError() == WSAETIMEDOUT)
{
printf("Request timed out.\n");
return;
}
}while(!success);
}
UID5380 帖子239 精华0 积分1289 阅读权限40 来自软件学院 在线时间81 小时 注册时间2006-5-22 最后登录2007-2-24 查看详细资料
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Platform: |
Size: 5881 |
Author: shuiyuan313 |
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Description: ARM7+D12开发U盘的资料(中文)，想用来玩u盘的同志们下载看看吧-ARM7 development of the U-D12 information (Chinese), would like to play for the u-download comrades see it
Platform: |
Size: 279552 |
Author: 李焱 |
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Description: u盘，mp3下的文件系统，完全兼容fat16，fat32，加上自己的硬盘驱动接口后应该可以使用-u disk, mp3 under the file system, fully compatible with fat16, fat32, coupled with their own hard disk drive interface should be able to use
Platform: |
Size: 280576 |
Author: |
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Description: 实现背包问题
package problem
1． 问题描述
假设有一个能装入总体积为T的背包和n件体积分别为w1 , w2 , … , wn 的物品，能否从n件物品中挑选若干件恰好装满背包，即使w1 +w2 + … + wn=T，要求找出所有满足上述条件的解。例如：当T=10，各件物品的体积{1，8，4，3，5，2}时，可找到下列4组解： （1，4，3，2）、（1，4，5）、（8，2）、（3，5，2）。
2． 基本要求
读入T、n、w1 , w2 , … , wn
3．提示：
可利用递归方法：若选中w1 则问题变成在w2 , … , wn 中挑选若干件使得其重量之和为T- w1 ，若不选中w1，则问题变成在w2 , … , wn 中挑选若干件使得其重量之和为T 。依次类推。
也可利用回溯法的设计思想来解决背包问题。首先将物品排成一列，然后顺序选取物品装入背包，假设已选取了前i 件物品之后背包还没有装满，则继续选取第i+1件物品，若该件物品“太大”不能装入，则弃之而继续选取下一件，直至背包装满为止。但如果在剩余的物品中找不到合适的物品以填满背包，则说明“刚刚”装入背包的那件物品“不合适”，应将它取出“弃之一边”，继续再从“它之后”的物品中选取，如此重复，，直至求得满足条件的解，或者无解。
注：没压缩密码-knapsack problem achieve a package problem. Problem description one would assume that the total volume of loaded backpack and T n size pieces of w1, w2, ..., wn items Can n items from the selected pieces were just filled with backpacks, even w1 w2 ... wn = T, asked to identify all of the above conditions are met solution. For example : when T = 10, the volume of items (1,8,4,3,5,2), may find the following four solutions : (1,4,3,2), (1,4,5), (8,2), (3,5,2). 2. Basic requirements read T, n, w1, w2, ..., wn 3. Tip : Recursive methods can be used : If the problem were selected w1 into the w2, ..., wn selected several pieces make its weight and as a T-w1, if selected w1, w2 issue into the .... wn selected several pieces make its weight and as T. Renumbered accordingly. Retrospective can also u
Platform: |
Size: 9216 |
Author: 李昭明 |
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Description: 调试通过的可以直接在NAND Flash 上启动的u-boot-1.1.6 (开发板：优龙st2410) 包括：cs8900网卡驱动，NAND Flash 烧写，NAND 环境变量保存（saveenv）, bootm, go, 网络下载tftpboot-debugging can be passed directly on the NAND Flash to initiate the u-boot-1.1.6 ( Plate : You Lung st2410) : cs8900 card driven, NAND Flash burning, NAND preserve the environment variables (saveenv), bootm, go, Download tftpboot network
Platform: |
Size: 9320448 |
Author: |
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Description: 一个很不错的词频统计程序,目前只支持英文,中文的本人正在修改中.改好后上传给大家分享-A very good frequency statistical procedures, is currently only supports English, Chinese, I am being revised. Improved after the upload to the U.S. to share
Platform: |
Size: 6265856 |
Author: 李龙 |
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Description: 非常好的klt算法的事例程序，大家多多下在亚，谢谢大家乐-Very good examples of KLT algorithm procedures, many in the U.S. in Asia, I would like to thank everyone Lok
Platform: |
Size: 693248 |
Author: 啊啊 |
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Description: 这是uboot1.1.5的一个补丁，打上这个补丁可以使uboot支持at91sam9260的开发板。
在EBD9260-p开发板上移植u-boot1.1.5可以从ATMEL的一块demo板（at91sam9260ek）的uboot文件里修改而得。其实1.1.5的uboot并不支持ATMEL的at91sam9260ek，只支持at91rm9200ek，通过ATMEL官方提供的u-boot-1.1.5_atmel_1.4.diff.bz2补丁可以使1.1.5的uboot支持at91sam9260ek，其实里面具体的工作也是将9200目录里的文件复制后修改成at91sam9260ek的。
-This is a uboot1.1.5 patch, marked with this patch can make uboot support at91sam9260 development board. EBD9260-p in the development of transplant board u-boot1.1.5 from ATMEL a demo board (at91sam9260ek) to amend the document derived from uboot. 1.1.5 In fact, uboot does not support the ATMEL
Platform: |
Size: 118784 |
Author: qianyou |
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Description: 基于freescale imx21 uboot启动的补丁程序，官方使用的是自己的启动程序，如果需要使用u-boot进行启动部分调试的朋友，可以试试！-Based on freescale imx21 uboot startup patch, official use of their own start-up procedure, if need to use u-boot to restart part of debugging Friend, you can try!
Platform: |
Size: 48128 |
Author: 付超 |
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Description: 44B0 开发板启动的 u-boot-1.2.0-0.tar.gz-44B0 development board to start u-boot-1.2.0-0.tar.gz
Platform: |
Size: 2640896 |
Author: 赵向群 |
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Description: 老外做的讲解u-boot相关知识的课件，非常好的资料。只不过都是英文。-On foreigners to do u-boot related knowledge courseware, very good information. Are in English only.
Platform: |
Size: 534528 |
Author: |
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Description: Patch to apply U-Boot for PXA270 with mainstone board. Should be useful to many people ... can also be helpful for people who are insterested in cross-platform porting-Patch to apply U-Boot for PXA270 with mainstone board. Should be useful to many people ... can also be helpful for people who are insterested in cross-platform porting
Platform: |
Size: 15360 |
Author: r |
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Description: 1 to 4 usb hub uPD720114 ET-0192 （4端口总线供电_自供电集线器）原理图-1 to 4 usb hub uPD720114 ET-0192 (4-port bus-powered, self-powered hub _) Schematic
Platform: |
Size: 39936 |
Author: czm |
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Description: 三星强片S3C6410开发板的bootloader源代码，注意为了能上传通过，在文件后缀添加了.zip，可以在下载完成后去掉这个后缀-Samsung S3C6410 film development board' s bootloader source code, pay attention to in order to be able to upload through the file suffix added. Zip, can download to remove the suffix after the completion of
Platform: |
Size: 7199744 |
Author: huangzhuo |
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Description: 功能概括
1. 自动监测U盘插入事件
2. 后台拷贝U盘文件内容到指定目录
3. 后台隐藏模式隐蔽运行
4. 可选随系统自动启动-Feature summary 1. Automatic Monitoring U disk insert events 2. Background U disk copy the contents of the documents to the designated directory 3. Background hidden covert operation mode 4. With the optional automatic start
Platform: |
Size: 69632 |
Author: 123 |
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Description: ARM11 S3C6410底层软件 UOOBT 启动 支持SD启动 WINCE LINUX TQ6410
u-boot 版本：u-boot-1.1.6
主要功能：
1、支持一键式菜单，操作简单方便
2、支持Nand Flash擦除、读、写
3、支持USB 下载镜像
4、支持打印、设置、保存环境变量
5、支持内存内容显示、对比、修改
6、支持bootm、bootargs设置
★ 提供源代码
-ARM11 S3C6410 UOOBT underlying software start-up support SD-WINCE LINUX TQ6410 u-boot version: u-boot-1.1.6 main function: 1, to support one-click menu, easy operation 2 in support of Nand Flash erase, read, write 3 , USB download mirror 4, to support printing, set, save the environment variable 5 to support the memory content display, contrast, modify 6, support bootm, bootargs set to provide the source code ★
Platform: |
Size: 2151424 |
Author: 马义忠 |
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Description: u-boot-1.3.4，对于学习ARM的人很有帮助，值得下载-u-boot-1.3.4, very helpful for people to learn ARM, worth downloading
Platform: |
Size: 7647232 |
Author: 张成 |
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Description: dspace1.7.2源码，DSpace（数字空间）系统是由美国麻省理工学院图书馆（MIT Libraries）和美国惠普公司实验室（Hewlett-Packard Labs）合作经过两年多的努力并于2002年10月开始投入使用的，以内容管理发布为设计目标，遵循BSD协议的开放源代码数字存储系统。该系统可以收 集、存储、索引、保存和重新发布任何数字格式、层次结构的永久标识符研究数据。
-dspace1.7.2 source, DSpace (digital space) systems by the U.S. Massachusetts Institute of Technology Library (MIT Libraries) and the U.S. Hewlett-Packard Laboratories (Hewlett-Packard Labs) co-operation, and after two years of hard work began in October 2002 put to use to publish content management for the design of the target, follow the open source BSD license digital storage systems. The system can collect, store, index, preserve and re-publish any digital format, a permanent identifier for the hierarchy of research data.
Platform: |
Size: 8114176 |
Author: 天天 |
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