pyinterp.reduced_gaussian.coalesce

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pyinterp.reduced_gaussian.coalesce#

pyinterp.reduced_gaussian.coalesce(ranges, io_gap)[source]#

Merge the ranges of a zone for reading, without changing the zone.

Many small reads cost more than a few larger ones: merging ranges closer than io_gap points reads the gaps too, then gather picks the values of the zone from what was read.

Parameters:

  • ranges (ArrayLike) – The ranges of a zone, as Zone.ranges() returns them.

  • io_gap (int) – Largest gap, in points, read to merge two ranges.

Returns:

the ranges to read, and the positions of the values of the zone in the concatenation of what they read.

Return type:

(merged, gather)

Example

>>> merged, gather = coalesce(zone.ranges(), io_gap=256)
>>> buffer = np.concatenate(
...     [values[start:stop] for start, stop in merged]
... )
>>> zone_values = buffer[gather]
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