vastorbit.VastFrame.abs¶

VastFrame.abs(columns: Annotated[str | list[str], 'STRING representing one column or a list of columns'] | None = None) → VastFrame¶

Applies the absolute value function to all input VastColumns.

Parameters:: columns (SQLColumns, optional) – List of the VastColumns names. If empty, all numerical VastColumns are used.
Returns:: self
Return type:: VastFrame

Examples

Let’s begin by importing vastorbit.

import vastorbit as vo

Hint

By assigning an alias to vastorbit, we mitigate the risk of code collisions with other libraries. This precaution is necessary because vastorbit uses commonly known function names like “average” and “median”, which can potentially lead to naming conflicts. The use of an alias ensures that the functions from vastorbit are used as intended without interfering with functions from other libraries.

Let us create a dummy dataset with negative values:

vdf = vo.VastFrame({"val" : [10, -10, 20, -2]})

	123 val Integer
1	20
2	-2
3	-10
4	10

Rows: 1-4 | Column: val | Type: integer

Now we can convert all to absolute values:

vdf.abs()

	123 val Integer
1	10
2	20
3	10
4	2

Rows: 1-4 | Column: val | Type: integer

Note

While the same task can be accomplished using pure SQL (see below), adopting a Pythonic approach can offer greater convenience and help avoid potential syntax errors.

vdf["val"] = "ABS(val)"