clearr=-0.8;x=-5000:10:-1000;k=2*3.1416*86/1000/340; p1=abs(sin(k*-x)+r*sin(k*x)); p2=abs(exp(1i*k*-x)+r*exp(1i*k*x)); plot(x,p1,x,p2);怎么不完全一样呢?