xinterp

This package enables index to value mapping both in a forward and backward way. inverse retrieval of indices from given values ca be done with different mathching rules (None, nearest, forward-fill, backward-fill). Results are exacts even using big integers values (e.g., nanseconds datetime64).

Installation

pip install xinterp

Usage

import numpy as np
from xinterp import forward, inverse

xp = np.array([0, 10, 20])
fp = np.array([0, 1000, 2000], dtype="datetime64[s]")

x = np.array([0, 5, 10, 15, 20])
result = forward(x, xp, fp)
expected = np.array([0, 500, 1000, 1500, 2000], dtype="datetime64[s]")
assert np.array_equal(result, expected)

x = np.array([1, 499, 1001, 1503, 1997], dtype="datetime64[s]")
result = inverse(x, xp, fp, method="nearest")
expected = np.array([0, 5, 10, 15, 20])
assert np.array_equal(result, expected)