How is this possible to calculate the variance of a gray scale image,I want to get it as a single number?

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JOSHY T R 2013 年 3 月 19 日

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https://jp.mathworks.com/matlabcentral/answers/67776-how-is-this-possible-to-calculate-the-variance-of-a-gray-scale-image-i-want-to-get-it-as-a-single-nu

I loaded an RGB image & converted it into gray scale using rgb2gray() command, also it was modified into an N-by-N matrix by zero appending. After these I tried to get a single value for the variance but the was an 1D array of elements. What can I do to get a single value. Please help me. Thanks to all who tries to help me.