CumMin / Computation Layer

Calculate the running minimum of values in a column. Similar to pandas cummin() or running min in SQL.

For each position i: $y_{i} = j = 1 min i (x_{j})$

Applications:

Low point tracking
Minimum threshold monitoring
Progressive minima

Note: Ignores null values. Direction controlled by Reverse parameter.

Table

Transforms

[, ...]

Select

column

The column for cumulative minimum. Example with [3, 1, 2, 4]:

Forward: [3, 1, 1, 1]
Reverse: [1, 1, 2, 4]

Reverse

bool

false

Controls accumulation direction:

false: scan from top to bottom
true: scan from bottom to top

Name for the new column. If not provided, the system generates a unique name. If AsColumn matches an existing column, the existing column is replaced. The name should follow valid column naming conventions.