matlab怎么画系统函数?怎么画系统变量对其导数的图像?>> y = dsolve('D2y+2*0*pi*Dy+pi^2*y=0','y(0)=1,Dy(0)=2','x');>> x = 0:0.1 :10>> plot(x,y)Error using plotConversion to double from sym is not possible.y现在是系统变量,我

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