数据处理函数列表

>>help datafun
  Data analysis and Fourier transforms.
 
  Basic operations.
    max         - Largest component.
    min         - Smallest component.
    mean        - Average or mean value.
    median      - Median value.
    mode        - Mode, or most frequent value in a sample.
    std         - Standard deviation.
    var         - Variance.
    sort        - Sort in ascending order.
    sortrows    - Sort rows in ascending order.
    issorted    - TRUE for sorted vector and matrices.
    sum         - Sum of elements.
    prod        - Product of elements.
    hist        - Histogram.
    histc       - Histogram count.
    trapz       - Trapezoidal numerical integration.
    cumsum      - Cumulative sum of elements.
    cumprod     - Cumulative product of elements.
    cumtrapz    - Cumulative trapezoidal numerical integration.
 
  Finite differences.
    diff        - Difference and approximate derivative.
    gradient    - Approximate gradient.
    del2        - Discrete Laplacian.
 
  Correlation.
    corrcoef    - Correlation coefficients.
    cov         - Covariance matrix.
    subspace    - Angle between subspaces.
 
  Filtering and convolution.
    filter      - One-dimensional digital filter.
    filter2     - Two-dimensional digital filter.
    conv        - Convolution and polynomial multiplication.
    conv2       - Two-dimensional convolution.
    convn       - N-dimensional convolution.
    deconv      - Deconvolution and polynomial division.
    detrend     - Linear trend removal.
 
  Fourier transforms.
    fft         - Discrete Fourier transform.
    fft2        - Two-dimensional discrete Fourier transform.
    fftn        - N-dimensional discrete Fourier Transform.
    ifft        - Inverse discrete Fourier transform.
    ifft2       - Two-dimensional inverse discrete Fourier transform.
    ifftn       - N-dimensional inverse discrete Fourier Transform.
    fftshift    - Shift zero-frequency component to center of spectrum.
    ifftshift   - Inverse FFTSHIFT.
    fftw        - Interface to FFTW library run-time algorithm tuning control.