### 6.3.26 Cumulated sum of the elements of a list

The cumSum command finds the partial sums of a list or sequence.

- cumSum takes L, a list or sequence of numbers or of strings.
- cumSum(L) returns the list or sequence with same length as L and whose kth element is the sum or concatenation of elements 0 through k of L.

#### Examples

cumSum(sqrt(2),3,4,5,6)

| √ |
2
| , | √ |
2
| +3, | √ |
2
| +3+4, | √ |
2
| +3+4+5, | √ |
2
| +3+4+5+6

normal(cumSum(sqrt(2),3,4,5,6))

| √ |
2
| , | √ |
2
| +3, | √ |
2
| +7, | √ |
2
| +12, | √ |
2
| +18

cumSum(1.2,3,4.5,6)

1.2,4.2,8.7,14.7 |  |  |  |  |  |  |  |  |  |

cumSum([0,1,2,3,4])

| ⎡ ⎣ | 0,1,3,6,10 | ⎤ ⎦

cumSum("a","b","c","d")

“a”,“ab”,“abc”,“abcd” |  |  |  |  |  |  |  |  |  |

cumSum(["a","ab","abc","abcd"])

| ⎡ ⎣ | “a”,“aab”,“aababc”,“aababcabcd” | ⎤ ⎦