cumsum(x), sum(x), prod(x), cumprod(x), if x=[1,2,4] in matlab

main.m
            x = [1, 2, 4];
            cumsum(x)   % Output: 1     3     7
            sum(x)      % Output: 7
            prod(x)     % Output: 8
            cumprod(x)  % Output: 1     2     8
            ``` 

            The `cumsum` function computes the cumulative sum of elements of an input array. It returns an array where each element is the sum of itself and all previous elements.

            The `sum` function computes the sum of elements of an input array.

            The `prod` function computes the product of elements of an input array.

            The `cumprod` function computes the cumulative product of elements of an input array. It returns an array where each element is the product of itself and all previous elements.
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