std與mean

std2計算矩陣元素的标準差；mean2計算矩陣元素的平均數。

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