foundryts.functions.first_point

foundryts.functions.first_point()

Returns a function that extracts the earliest point for a single time series.

The returned point is the first occuring point within the range of a given time series. Returns an empty summary when the series is empty.

• Returns: A function that accepts a single time series and returns the first point in the provided series. The dataframe contains a single row with the first point.
• Return type: (FunctionNode) -> SummarizerNode

Dataframe schema

Examples

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>>> series = F.points(
...     (1, 0.0),
...     (101, 10.2),
...     (200, 11.3),
...     (123450, 11.8),
... )
>>> series.to_pandas()
                      timestamp  value
0 1970-01-01 00:00:00.000000001    0.0
1 1970-01-01 00:00:00.000000101   10.2
2 1970-01-01 00:00:00.000000200   11.3
3 1970-01-01 00:00:00.000123450   11.8

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>>> fp = F.first_point()(series)
>>> fp.to_pandas()
                      timestamp  value
0 1970-01-01 00:00:00.000000001    0.0