1.>> x=linspace(0,2*pi,100); >>y=sin(x).*cos(5*x); >> plot(x,y)2.>> x=linspace(0,2*pi,100); >>y=abs(1000*sin(4*x))+1; >> semilogy(x,y)3.没函数4.>>x=0:0.01:2 >>y=0:0.01:2 >>z=sin(x)'*cos(y) >> mesh(x,y,z) >> surf(x,y,z)