matlab中的std2和mean2

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std2计算矩阵元素的标准差；mean2计算矩阵元素的平均数。

help std2
STD2 Compute standard deviation of matrix elements.
    B = STD2(A) computes the standard deviation of the values in
    A.

    Class Support
    -------------
    A can be numeric or logical. B is a scalar of class double.

    Example
    -------
        I = imread('liftingbody.png');
        val = std2(I)

    See also corr2, mean2, mean, std.

Reference page in Help browser
doc std2

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help mean2
MEAN2 Compute mean of matrix elements.
    B = MEAN2(A) computes the mean of the values in A.

    Class Support
    -------------
    A can be numeric or logical. B is a scalar of class double.

    Example
    -------
        I = imread('liftingbody.png');
        val = mean2(I)

    See also mean, std, std2.

Reference page in Help browser
doc mean2