cumsum

Cumulative sum along a dimension.

Syntax

B = cumsum(A)
B = cumsum(A, dim)

Description

Returns an array of the same size as A where each element is the running sum from the start of its row/column up to that position. With no dimension argument, accumulates along the first non-singleton dimension.

Examples

cumsum([1 2 3 4])           % [1 3 6 10]
cumsum([1 2; 3 4])          % [1 2; 4 6]   column cumulative sums
cumsum([1 2; 3 4], 2)       % [1 3; 3 7]   row cumulative sums

See also

• sum — Sum elements of an array.
• cumprod — Cumulative product along a dimension.