matlab基本语法

%基本绘图
x = 0:0.5:2*pi;
y = sin(x);

plot(x,y);

%第二个参数为矩阵
y1 = sin(x);
y2 = cos(x);
y3 = 0.02 * exp(x);
y4 = x;
y5 = 0.02 * tan(x);

z = [y1;y2;y3;y4;y5];
plot(x,z);

%两个参数都是矩阵
x1 = 0:0.01:2 * pi;
x2 = -pi:0.01:pi;
x  = [x1;x2];

y1 = cos(x1);
y2 = sin(x2);

y = [y1;y2];
plot(x,y);
%plot只有一个参数
x = linspace(0,2*pi,200);
y = sin(x);
plot(y);
y2 = cos(x);
plot(y2);
y3 = y + i * y2;
plot(y3);

%plot有多个参数
x1 = linspace(0,2*pi,200);
x2 = linspace(0,2*pi,100);
y1 = cos(x1);
y2 = sin(x2);
plot(x1,y1,x2,y2);

%plot含有的曲线选项
x = linspace(0,2*pi,100);
y = sin(x);
plot(x,y,‘k‘);%  r(红)，g(绿)，y(黄)，m(品红)，k(黑色)，b(蓝色)
plot(x,y,‘.‘);%*   .   P  <>
plot(x,y,‘--‘);%--  -  -. :(连接方式)
plot(x,y,‘rp--‘);

%%图形的标注
x = linspace(0,2*pi,100);
y = sin(x);
plot(x,y);
xlabel(‘x‘);
ylabel(‘y‘);
title(‘sin‘);
text(3,0,‘y = sin(x)‘);
text(5,0.5,‘x^2‘);

x1 = linspace(0,2*pi,200);
x2 = linspace(0,2*pi,100);
y1 = cos(x1);
y2 = sin(x2);
plot(x1,y1,x2,y2);
legend(‘cos‘,‘sin‘);
xlim([-20,20]);

x = linspace(0,2*pi,200);
y = sin(x);
plot(y);
y2 = cos(x);
plot(y2);
y3 = y + i * y2;
plot(y3);
%坐标轴控制
axis equal%aquare是矩形

%%图形保持
x = 0:0.01:2*pi;
y1 = sin(x);
y2 = cos(x);
hold on
plot(x,y1,‘r‘)
plot(x,y2,‘k‘)
hold off

%%窗口分割
x = 0:0.01:2*pi;
y1 = sin(x);
y2 = cos(x);
y3 = tan(x);
y4 = exp(x);
subplot(2,2,1)%jia那个图形窗口绘制成2*2的窗口，使用第一窗口
plot(x,y1)
subplot(222)
plot(x,y2)
subplot(223)
plot(x,y3)
subplot(224)
plot(x,y4)