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ch6_1_1.cpp
//***********************
//** ch6_1_1.cpp **
//***********************
extern int n; //n由另一个源文件定义
void fn2() //fn2()函数用于另一个源文件
{
n=8; //使用n
}
e-6-1-1.txt
#include "stdafx.h"
#include
using namespace std;
class R1;
class R2;
class R1{
int r;
public:
R1(int i)
{r=i;}
friend void sq(R1 a,R2 b);
};
class R2{
int r;
public:
mux3to1_1.vhd
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity mux3to1_1 is
port(a,c :in std_logic;
b :in std_logic;
sel1,sel2:in std_lo
d1r1.cpp
#include "iostream.h"
#include "math.h"
void gaussj(double a[], int n, double b[])
{
int i,j,k,l,ll,irow,icol;
double big,pivinv,dum;
int ipiv[50], indxr[50], indxc[50];
for (j=0;j
c1_1_3.m
%filename:c1_1_3.m
rand('seed',0);
x=rand(50,1)*4-2;
y=rand(50,1)*4-2;
z=x.*y.*exp(-x.^2-y.^2);
figure(1)
zmax=max(z);
zmin=min(z);
bm=zmin-0.25*(zmax-zmin);
top=zmax+0.25*(zmax-zmin);
plot3
c2_1_1.m
%filename:c2_1_1.m
h=0.1*pi;
x=0:h:2*pi;
y=sin(x);
dy1=diff(y)/h;
dy2=diff3p(y,h);
dy0=cos(x);
error1=norm(dy1-dy0(1:20));
error2=norm(dy2-dy0);
dyo2=diff3p(y,h,2);%dy3=ppval(fnder(spline(x