numba np.concatenate

NISHIO Hirokazu [Translate]

numba np.concatenate
In numba world, np.concatenate can not concatenate np.array and list. (as of numba 0.50)

 np.concatenate(): expecting a non-empty tuple of arrays, got Tuple(array(int64, 1d, C), list(int64)) 

pythonimport numba
import numpy as np


@numba.njit
def foo():
    x = np.array([1, 2, 3])

    # OK
    print(np.concatenate((x, x)))

    # NG
    print(np.concatenate((x, [1, 2, 3])))
    # TypeError: np.concatenate(): expecting a non-empty tuple of arrays, got Tuple(array(int64, 1d, C), list(int64))


foo()

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(C)NISHIO Hirokazu / Converted from [Scrapbox] at 11/23/2025, 6:17:37 PM[Edit]

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