# Data Analysis and Fourier Transform Functions

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    Basic Operations
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    cumprod    Cumulative product of elements.
    cumsum     Cumulative sum of elements.
    max        Largest component.
    mean       Average or mean value.
    median     Median value.
    min        Smallest component.
    prod       Product of elements.
    sort       Sort in ascending order.
    std        Standard deviation.
    sum        Sum of elements.
    trapz      Numerical integration using trapezoidal method.
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    Finite Differences
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    del2       Five-point discrete Laplacian.
    diff       Difference function and approximate derivative.
    gradient   Approximate gradient.
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    Correlation
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    corrcoef   Correlation coefficients.
    cov        Covariance matrix.
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    Filtering and Convolution
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    conv       Convolution and polynomial multiplication.
    conv2      Two-dimensional convolution.
    deconv     Deconvolution and polynomial division.
    filter     One-dimensional digital filter.
    filter2    Two-dimensional digital filter.
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    Fourier Transforms
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    abs        Magnitude.
    angle      Phase angle.
    cplxpair   Sort numbers into complex conjugate pairs.
    fft        Discrete Fourier transform.
    fft2       Two-dimensional discrete Fourier transform.
    fftshift   Move zeroth lag to center of spectrum.
    ifft       Inverse discrete Fourier transform.
    ifft2      Two-dimensional inverse discrete Fourier transform.
    nextpow2   Next higher power of 2.
    unwrap     Remove phase angle jumps across 360\xa1  boundaries.
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    Vector Functions
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    cross      Vector cross product.
    dot        Vector dot product.
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(c) Copyright 1994 by The MathWorks, Inc.