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Sums and Products

sum (x, dim) Built-in Function
Sum of elements along dimension dim. If dim is omitted, it defaults to 1 (column-wise sum).

As a special case, if x is a vector and dim is omitted, return the sum of the elements.

prod (x, dim) Built-in Function
Product of elements along dimension dim. If dim is omitted, it defaults to 1 (column-wise products).

As a special case, if x is a vector and dim is omitted, return the product of the elements.

cumsum (x, dim) Built-in Function
Cumulative sum of elements along dimension dim. If dim is omitted, it defaults to 1 (column-wise cumulative sums).

As a special case, if x is a vector and dim is omitted, return the cumulative sum of the elements as a vector with the same orientation as x.

cumprod (x, dim) Built-in Function
Cumulative product of elements along dimension dim. If dim is omitted, it defaults to 1 (column-wise cumulative products).

As a special case, if x is a vector and dim is omitted, return the cumulative product of the elements as a vector with the same orientation as x.

sumsq (x, dim) Built-in Function
Sum of squares of elements along dimension dim. If dim is omitted, it defaults to 1 (column-wise sum of squares).

As a special case, if x is a vector and dim is omitted, return the sum of squares of the elements.

This function is conceptually equivalent to computing

sum (x .* conj (x), dim)
but it uses less memory and avoids calling conj if x is real.