Welcome any forms of ideas and advices 0917

2. lookfor命令 lookfor 命令通过搜索所有的MATLAB help，返回包含指定关键词的那些项。例如，希望得到各种有关的FFT运算方法，可以 lookfor FFT Discrete Fourier transform. FFT 2 Two-dimensional

Using Toolbox Path Cache. Type "help toolbox_path_cache" for more info. To get started, select

>> num=[1, 2, 3]; den=[1, 3, 3, 1]; [r, p, k]=residue(num, den) p= r=

>> den=[1 9 32 58 57 29 6] p= den = 1 -3. 0000

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Welcome any forms of ideas and advices! 0917 -3272388 huhao 1111@263. net

2. lookfor命令 lookfor 命令通过搜索所有的MATLAB help，返回包含指定关键词的那些项。例如，希望得到各种有关的FFT运算方法，可以 lookfor FFT Discrete Fourier transform. FFT 2 Two-dimensional discrete Fourier Transform. FFTN N-dimensional discrete Fourier Transform. FFTSHIFT Shift DC component to center of spectrum. IFFT Inverse discrete Fourier transform. IFFT 2 Two-dimensional inverse discrete Fourier transform. IFFTN N-dimensional inverse discrete Fourier transform. IFFTSHIFT Inverse FFT shift. INTERPFT 1 -D interpolation using FFT method. 可以进一步使用help命令察看所找到的命令。使用lookfor命令最重要的是关键词不必为MATLAB命令，它提供了一种通过一般关键词找到命令和帮助标题的方式。

Using Toolbox Path Cache. Type "help toolbox_path_cache" for more info. To get started, select "MATLAB Help" from the Help menu. Exam. >> num=[2 5 3 6] num = 2 5 3 6 >> den=[1 6 11 6] p= den = 1 6 11 6 -3. 0000 >> [r, p, k]=redidue(num, den) -2. 0000 ? ? ? Undefined function or variable 'redidue'. -1. 0000 >> [r, p, k]=residue(num, den) k= 2 r= -6. 0000 -4. 0000 3. 0000 >>

>> num=[1, 2, 3]; den=[1, 3, 3, 1]; [r, p, k]=residue(num, den) p= r= -1. 0000 0. 0000 -1. 0000 2. 0000 k= []

>> den=[1 9 32 58 57 29 6] p= den = 1 -3. 0000 9 32 58 57 29 >> num=[1 2 3] num = 1 6 -2. 0000 -1. 0000 2 3 >> [r, p, k]=residue(num, den) r= -1. 0000 k= -0. 3750 3. 0000 -2. 6250 2. 2500 -1. 5000 1. 0000 [] >>