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DataFrame.cumSum
Return cumulative sum over a DataFrame or Series axis.
danfo.DataFrame.cumSum(options)
Parameters
Type
Description
Default
options
Object
axis: 0 for row and 1 for column
inplace: Boolean indicating whether to perform the operation inplace or not. Defaults to false
{axis: 1, inplace: false}

Examples

Cumulative sum of elements along default axis (row)

Node
Browser
const dfd = require("danfojs-node")
​
let data = [[11, 20, 3], [1, 15, 6], [2, 30, 40], [2, 89, 78]]
let cols = ["A", "B", "C"]
​
let df = new dfd.DataFrame(data, { columns: cols })
let new_df = df.cumSum({ axis: 0 })
​
new_df.print()
​
Output
╔═══╤═══════════════════╤═══════════════════╤═══════════════════╗
║ │ A │ B │ C ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 0 │ 11 │ 20 │ 3 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 1 │ 12 │ 35 │ 9 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 2 │ 14 │ 65 │ 49 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 3 │ 16 │ 154 │ 127 ║
╚═══╧═══════════════════╧═══════════════════╧═══════════════════╝

Cumulative sum of elements along column axis (1)

Node
Browser
const dfd = require("danfojs-node")
​
data = [[11, 20, 3], [1, 15, 6], [2, 30, 40], [2, 89, 78]]
cols = ["A", "B", "C"]
​
let df = new dfd.DataFrame(data, { columns: cols })
let new_df = df.cumsum({ axis: 1 })
​
new_df.print()
​
Output
╔═══╤═══════════════════╤═══════════════════╤═══════════════════╗
║ │ A │ B │ C ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 0 │ 11 │ 31 │ 34 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 1 │ 1 │ 16 │ 22 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 2 │ 2 │ 32 │ 72 ║
╟───┼───────────────────┼───────────────────┼───────────────────╢
║ 3 │ 2 │ 91 │ 169 ║
╚═══╧═══════════════════╧═══════════════════╧═══════════════════╝
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Examples
Cumulative sum of elements along default axis (row)
Cumulative sum of elements along column axis (1)