Cumulative sum

cumsum

Cumulative sum

Syntax

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

Description

B = cumsum(A) returns the cumulative sum along different dimensions of an array.

If A is a vector, cumsum(A) returns a vector containing the cumulative sum of the elements of A.

If A is a matrix, cumsum(A) returns a matrix the same size as A containing the cumulative sums for each column of A.

If A is a multidimensional array, cumsum(A) works on the first nonsingleton dimension.

B = cumsum(A,dim) returns the cumulative sum of the elements along the dimension of A specified by scalar dim. For example, cumsum(A,1) works across the first dimension (the rows).

Examples

• cumsum(1:5)
  ans =
         [1  3  6  10  15]
  
  A = [1 2 3; 4 5 6];
  
  cumsum(A)
  ans =
         1     2     3
         5     7     9
  
  cumsum(A,2)
  ans =
         1     3     6
         4     9    15