metricmatlab
ch ¬ ng 4
Ma trË n - c¸ c phÐ p to¸ n vÒ ma trË n.
4.1 Kh¸ i niÖ m:
- Trong MATLAB d÷ liÖ u ® Ó ® a vµ o xö lý d íi d¹ ng ma trË n.
- Ma trË n A cã n hµ ng, m cét ® î c gä i lµ ma trË n cì n m. § î c ký hiÖ u An m
- PhÇ n tö aij cñ a ma trË n An m lµ phÇ n tö n» m ë hµ ng thø i, cét j .
- Ma trË n ® ¬ n ( sè ® ¬ n lÎ ) lµ ma trË n 1 hµ ng 1 cét.
- Ma trË n hµ ng ( 1 m ) sè liÖ u ® î c bè trÝ trª n mét hµ ng.
a11 a12 a13 ... a1m
- Ma trË n cét ( n 1) sè liÖ u ® î c bè trÝ trª n 1 cét.
溫度華氏轉(zhuǎn)變攝氏
#include <stdio.h>
#include <stdlib.h>
enum x {A,B,C,D,E}
int main(void)
{
int a=73,b=85,c=66
{
if (a>=90)
printf("a=A等級!!\n")
else if (a>=80)
printf("73分=B等級!!\n")
else if (a>=70)
printf("73分=C等級!!\n")
else if (a>=60)
printf("73分=D等級!!\n")
else if (a<60)
printf("73分=E等級!!\n")
}
{
if (b>=90)
printf("b=A等級!!\n")
else if (b>=80)
printf("85分=B等級!!\n")
else if (b>=70)
printf("85分=C等級!!\n")
else if (b>=60)
printf("85分=D等級!!\n")
else if (b<60)
printf("85分=E等級!!\n")
}
{
if (c>=90)
printf("c=A等級!!\n")
else if (c>=80)
printf("66分=B等級!!\n")
else if (c>=70)
printf("66分=C等級!!\n")
else if (c>=60)
printf("66分=D等級!!\n")
else if (c<60)
printf("66分=E等級!!\n")
}
system("pause")
return 0
}
溫度華氏轉(zhuǎn)變攝氏
#include <stdio.h>
#include <stdlib.h>
enum x {A,B,C,D,E}
int main(void)
{
int a=73,b=85,c=66
{
if (a>=90)
printf("a=A等級!!\n")
else if (a>=80)
printf("73分=B等級!!\n")
else if (a>=70)
printf("73分=C等級!!\n")
else if (a>=60)
printf("73分=D等級!!\n")
else if (a<60)
printf("73分=E等級!!\n")
}
{
if (b>=90)
printf("b=A等級!!\n")
else if (b>=80)
printf("85分=B等級!!\n")
else if (b>=70)
printf("85分=C等級!!\n")
else if (b>=60)
printf("85分=D等級!!\n")
else if (b<60)
printf("85分=E等級!!\n")
}
{
if (c>=90)
printf("c=A等級!!\n")
else if (c>=80)
printf("66分=B等級!!\n")
else if (c>=70)
printf("66分=C等級!!\n")
else if (c>=60)
printf("66分=D等級!!\n")
else if (c<60)
printf("66分=E等級!!\n")
}
system("pause")
return 0
}
跨數(shù)據(jù)庫平臺(tái):
n 支持 oracle 的OCI
n 支持DB2的CLI,
n 支持ODBC(通過ODBC,可支持SQL SERVER,MySQL等)
Ø 跨OS平臺(tái):
n 標(biāo)準(zhǔn)C++語言,支持 unix/linux/windows
Ø 使用簡單:
n 只有一個(gè)頭文件
n 接口簡潔.otl_stream, otl_connect, otl_exception等就可以完成大部分工作
n 相對 ProC等嵌入式開發(fā),代碼能相應(yīng)減少
Ø 性能:
n 直接訪問數(shù)據(jù)庫API接口,具有API接口的高效率,可靠性
Ø 穩(wěn)定性:
n 開源代碼,唯一的代碼文件otlv4.h,可以了解所有基于數(shù)據(jù)庫API的實(shí)現(xiàn)細(xì)節(jié)
n 從1996年開始,到今已10余年.
Ø 可讀性及可維護(hù)性:
n 標(biāo)準(zhǔn)C++代碼,不需要任何預(yù)處理
n 使用流的形式,輸入輸出異常簡潔
n 減少大量代碼,
n 代碼結(jié)構(gòu)更加簡潔
參考資料:
http://otl.sourceforge.net/
1、 了解系統(tǒng)調(diào)用pipe()的功能和實(shí)際原理
2、 編寫一段程序，使用管道實(shí)現(xiàn)父子進(jìn)程之間的通信
a) 使用系統(tǒng)調(diào)用fork()創(chuàng)建一個(gè)子進(jìn)程
b) 子進(jìn)程調(diào)用函數(shù)write()向父進(jìn)程發(fā)送自己的進(jìn)程ID和字符串” s sending a message to parent.\n”。
c) 父進(jìn)程調(diào)用函數(shù)read()通過管道讀出子進(jìn)程發(fā)來的消息，將消息輸出屏幕，然后終止
This book is the most accurate and up-to-date source of information the STL currently available. ... It has an approach and appeal of its own: it explains techniques for building data structures and algorithms on top of the STL, and in this way appreciates the STL for what it is - a framework. Angelika Langer, Independent Consultant and C++ Report Columnist "A superbly authored treatment of the STL......an excellent book which belongs in any serious C++ developer s library." Jim Armstrong, President 2112 F/X, Texas. \n
The C++ Standard Template Library (STL) represents a breakthrough in C++ programming techniques. With it, software developers can achieve vast improvements in the reliability of their software, and increase their own productivity.
