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unit unitypes; interface uses Math, Windows, Forms, SysUtils, Variants, Classes, Graphics; { const Pi_1: extended = Pi; Pi_1_2: extended = Pi / 2; Pi_3_2: e

unit unitypes interface uses Math, Windows, Forms, SysUtils, Variants, Classes, Graphics; { const Pi_1: extended = Pi; Pi_1_2: extended = Pi / 2; Pi_3_

%目标函数 function y=ft(x); y=x.*sin(10*pi*x)+2;

%用ezplot将符号表达式图形化 y=sym('-1/3*x^3+1/3*x^4') ezplot(y)%绘制符号函数y在[－2*pi,2*pi]中的图形 ezplot(y,[0,100])%绘制符号函数y在[0,100]中的图形

%用罗盘图和羽毛图绘制复向量 theta=0:0.2:2*pi; z=sin(theta).*exp(j*theta); compass(z) feather(z)

%用plot(x1,y1,x2,y2,…)绘制多条曲线 x=0:0.1:2*pi; plot(x,sin(x),x,cos(x),x,sin(3*x)) %画三条曲线

%用hold命令在同一窗口多次叠绘，用plotyy在同一图形绘制两条曲线 x1=0:0.1:2*pi; plot(x1,sin(x1)) hold on x2=-pi:.1:pi; plot(x2,cos(x2)) plotyy(x1,sin(x1),x2,cos(x2))

%用plot3三维曲线绘图 x=0:0.1:20*pi; plot3(x,sin(x),cos(x)) %按系统默认设置绘图

%绘制正弦曲线和方波曲线 x1=0:0.1:2*pi; y1=sin(x1); %y1为x1的正弦函数 plot(x1,y1) x2=[0 1 1 2 2 3 ]; y2=[1 1 0 0 1 1 ]; plot(x2,y2)%将坐标轴范围设定为0-4和0-2 axis([0 4 0 2]) %将坐标轴范围设定为0-4和0-2

%数组的算术运算函数 x=linspace(0,2*pi,6) y=sin(x) %计算正弦 y1=abs(y) %计算绝对值，将正弦曲线变成全波整流 1-exp(-x).*y %计算按指数衰减的正弦曲线