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x=[0:3*pi/2/200:3*pi/2]; y=cos(15*x); I=quadspln(x,y,0,3*pi/2) x0=[0:3*pi/2/1000:3*pi/2]; y0=cos(15*x0); y1=interp1(x,y,x0,'spline'); plot(x,y,x0,y1,':')

function P_Azimuth_Elevation_f %========空间二维到达角及频率的估计 2008.4.6 by xray========== %========采用均匀平行线阵并用ESPRIT算法对到达角进行估计= clc; clear; close all; tic M=8;

function L_Azimuth_Elevation_f %========空间二维到达角及频率的估计 2008.4.6 by xray========== %========采用均匀L型线阵并用ESPRIT算法对二维到达角进行估计= clc; clear; close all; tic M=8;

%微积分例1:一元函数求导（diff,gradient) clear;close; x=-2*pi:0.1:2*pi; y=sin(x); dy=diff(y)./diff(x); plot(x,y,x(1:length(x)-1),dy); hold on; yx =gradient(y,x); plot(x,yx,'ro');

#include #include void main(void) { double pi = 3.14159265; printf("Tangent of pi is %f\n", tan(pi)); printf("Tangent of pi/4 is %f\n", tan(pi / 4.0)); }

// Section 7.3.1 // $ CC ptrswap.cpp main3_1b.cpp /* Before ptrswap(): pi: 10 pj: 20 After ptrswap(): pi: 20 pj: 10 */ #include using std::cout; using std::en

// #include // #include #include #include #include /***** pi: 4 *pi: 4 st1: 12 st2: 12 ps: 4 *ps: 12 short : 2 short* : 4

close all clear all; N=60; c=1500; f=1500; a=2*pi/N; lamda=c/f; r=lamda/0.4; x=0:pi/180:pi; a=0; b=0; theter=[0,pi/6]; for j=1:2 for i=1:60 derta=r/c*[cos(x-(i-1)*a)-c

%用零阶bessel函数近似描述圆阵的指向性（必须满足条件：N>=4*pi*r/lamda+2） clear all; close all; N=60; alpha=2*pi/N; c=1500; f=1500; lamda=c/f; r=lamda/0.4; x=0:pi/180:pi; y1=4*pi*r/lamda*sin(x/2); z1=bessel(0,y1)

%用公式法实现圆阵指向性图的绘制 close all clear all; N=60; c=1500; f=1500; alpha=2*pi/N; lamda=c/f; r=lamda/0.4; x=0:pi/180:pi; theter=[0 pi/6]; for j=1:2 a=0;b=0; for i=1:60 derta=r