y=(330-x).(x<130)+(290-x).(x>130);
plot(x,y)
y=(330-x).(x<129)+(290-x).(x>130);
plot(x,y)
或者
x1 = -1:0.1:0;
y1 = x1;
x2 = 0:0.1:1;
y2 = 2*x2;
plot([x1 x2],[y1 y2]);plot([x1 x2],[y1 y2]);
y=(330-x).(x<130)+(290-x).(x>130);
plot(x,y)
y=(330-x).(x<129)+(290-x).(x>130);
plot(x,y)
或者
x1 = -1:0.1:0;
y1 = x1;
x2 = 0:0.1:1;
y2 = 2*x2;
plot([x1 x2],[y1 y2]);plot([x1 x2],[y1 y2]);