matlab求导数Clear, dx = 0.01*2*pi ;x = 0:dx:2*pi ;y =exp(-0.5*x)*sin(2*x);F1=diff(y)/dx;F1=[f1(1),(f1(1:end-1)+f1(2:end))/2,f1(end)];Figure,plot(x, -0.5*exp(-0.5*x)*sin(2*x)+2 exp(-0.5*x)*cos(2*x),x,f1,’.’)Y=sym(‘exp(-0.5*x)*sin(2*x)’);Dy
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![matlab求导数Clear, dx = 0.01*2*pi ;x = 0:dx:2*pi ;y =exp(-0.5*x)*sin(2*x);F1=diff(y)/dx;F1=[f1(1),(f1(1:end-1)+f1(2:end))/2,f1(end)];Figure,plot(x, -0.5*exp(-0.5*x)*sin(2*x)+2 exp(-0.5*x)*cos(2*x),x,f1,’.’)Y=sym(‘exp(-0.5*x)*sin(2*x)’);Dy](/uploads/image/z/1108492-52-2.jpg?t=matlab%E6%B1%82%E5%AF%BC%E6%95%B0Clear%2C+dx++%3D+0.01%2A2%2Api+%3Bx+%3D+0%3Adx%3A2%2Api+%3By+%3Dexp%28-0.5%2Ax%29%2Asin%282%2Ax%29%3BF1%3Ddiff%28y%29%2Fdx%3BF1%3D%5Bf1%281%29%2C%28f1%281%3Aend-1%29%2Bf1%282%3Aend%29%29%2F2%2Cf1%28end%29%5D%3BFigure%2Cplot%28x%2C+-0.5%2Aexp%28-0.5%2Ax%29%2Asin%282%2Ax%29%2B2+exp%28-0.5%2Ax%29%2Acos%282%2Ax%29%2Cx%2Cf1%2C%E2%80%99.%E2%80%99%29Y%3Dsym%28%E2%80%98exp%28-0.5%2Ax%29%2Asin%282%2Ax%29%E2%80%99%29%3BDy)
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