将float转换为字符串numba python numpy数组 [英] convert float to string numba python numpy array

问题描述

我正在运行@nb.njit函数，试图在其中将整数放入字符串数组中.

I am running a @nb.njit function within which I am trying to put an integer within a string array.

import numpy as np
import numba as nb

@nb.njit(nogil=True)
def func():
    my_array = np.empty(6, dtype=np.dtype("U20"))
    my_array[0] = np.str(2.35646)
    return my_array


if __name__ == '__main__':
    a = func()
    print(a)

我遇到以下错误:

numba.errors.TypingError: Failed in nopython mode pipeline (step: nopython frontend)
Invalid use of Function(<class 'str'>) with argument(s) of type(s): (float64)

我应该使用哪个函数在numba中从float转换为string?

Which function am I supposed to use to do the conversion from float to string within numba ?

推荐答案

到目前为止，尚不支持numpy.str函数.提供了所有支持的numpy函数的列表.在Numba的网站上.

The numpy.str function is not supported so far. A list of all the supported numpy functions is available on Numba's website.

也不支持内置的str.可以在支持的Python功能页面上进行检查.

The built-in str is not supported either. This can be checked on the supported Python features page.

执行尝试操作的唯一方法是仅使用Numba支持的Python和Numpy功能，通过某种方式使函数将浮点数转换为字符串.

The only way to do what you are trying would be to somehow make a function that converts a float to a string, using only the features of Python and Numpy supported by Numba.

在朝这个方向前进之前，我将重新考虑将浮点数转换为字符串的必要性.它可能不是很有效，并且由于将float转换为string而增加了一些开销，因此您可能会失去通过添加一些功能而失去的优势.

Before going in this direction, I would nevertheless reconsider the necessity to convert floats into strings. It may not be very efficient and you may lose the benefit of jitting a few functions by adding some overhead due to the conversion of floats to string.

当然，如果不进一步了解该项目，这很难说.

Of course, this is hard to tell without knowing more about the project.

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