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How to implement the following formula in MATLAB?

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Jes
Jes 2015-7-8
关闭： MATLAB Answer Bot 2021-8-20
E=summation summation summation v^2(x,y,z)
where x, y and z are the limits of summation respectively. V is a 208x176x176 matrix .
Any help is appreciated. Thanks

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回答（2 个）

Rohit Kudva
Rohit Kudva 2015-7-17
Hi,
I am assuming that you want to sum up all elements of 'V^2' where V is a 3D matrix. You can implement it using the sum function as follows:
>> sum(sum(sum(V.^2)));
'V.^2' computes element-wise square for each element in matrix 'V'. The above line of code will return a single scalar value which is the sum of all elements in 'V.^2' 3D matrix. You can replace 'V.^2' in the above line of code by the expression 'V.*V'.
I hope this answers helps you.
- Rohit
Image Analyst
Image Analyst 2015-7-17
You don't need to call sum() three times. Simply try this:
E = sum(V(:).^2);

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