傅里叶级数作图f(x)=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]
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傅里叶级数作图f(x)=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]
我用mathematica输入程序
Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x],-2sin[x] + sin[2x] -2/3sin[3x] + 1/2sin[4x]},{x,-Pi,Pi},AspectRatio -> Automatic,Axes -> False]
系统提示:Plot::plnr:2 sin[x] is not a machine-size real number at x =- 3.14159
这是怎么回事,如果可以的话,给出正确的程序,
如果能给出其在MATLAB中的作图程序也可以
我用mathematica输入程序
Plot[{2sin[x],-2sin[x],2sin[x] - sin[2x],-2sin[x] + sin[2x],2sin[x] - sin[2x] + 2/3sin[3x],-2sin[x] + sin[2x] - 2/3sin[3x],2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x],-2sin[x] + sin[2x] -2/3sin[3x] + 1/2sin[4x]},{x,-Pi,Pi},AspectRatio -> Automatic,Axes -> False]
系统提示:Plot::plnr:2 sin[x] is not a machine-size real number at x =- 3.14159
这是怎么回事,如果可以的话,给出正确的程序,
如果能给出其在MATLAB中的作图程序也可以
![傅里叶级数作图f(x)=2sin[x] - sin[2x] + 2/3sin[3x] - 1/2sin[4x]](/uploads/image/z/18316342-46-2.jpg?t=%E5%82%85%E9%87%8C%E5%8F%B6%E7%BA%A7%E6%95%B0%E4%BD%9C%E5%9B%BEf%EF%BC%88x%EF%BC%89%3D2sin%5Bx%5D+-+sin%5B2x%5D+%2B+2%2F3sin%5B3x%5D+-+1%2F2sin%5B4x%5D)
x=linspace(-4*pi,4*pi,1000);y=2*sin(x)-sin(2*x)+(2/3)*sin(3*x)-(1/2)*sin(4*x);plot(x,y)
![](http://img.wesiedu.com/upload/8/c5/8c548f6c5fad2adb1c27ff77475dc9fb.jpg)
![](http://img.wesiedu.com/upload/8/c5/8c548f6c5fad2adb1c27ff77475dc9fb.jpg)
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