numpy将特定值更改为null会出现错误“ValueError：无法将浮点NaN转换为整数”

wnavrhmk 于 2023-04-21 发布在其他

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我有一个形状为（1，5，10）的numpy数组。

array([[[ -5,  -5,  -5,  -5, 120, 116, 118, 118,  -5,  -5],
        [ -5,  -5, 126, 127, 125, 118, 118, 123,  -5,  -5],
        [ -5, 121, 125, 118, 115, 115, 121, 121, 114, 127],
        [112, 118, 108, 111, 110, 112, 104, 102, 103,  -5],
        [105, 108, 107,  -5,  -5,  -5,  -5,  -5,  -5,  -5]]], dtype=int16)

我想把所有的-5都换成np.nan值。为了做到这一点，我写了以下代码：

out_image[out_image == (-5)] = np.nan

但这给了我一个错误：
ValueError：无法将float NaN转换为整数
为什么我会得到这个错误？我如何将值替换为nan？

numpy

来源：https://stackoverflow.com/questions/71828900/numpy-change-specific-value-to-null-gives-error-valueerror-cannot-convert-floa

3条答案

按热度按时间

bvjxkvbb1#

你只需要先将它转换为float。

out_image = out_image.astype('float')
out_image[out_image== -5] = np.NAN

赞(0）回复(0）举报 2023-04-21

ig9co6j12#

你可以把out_image当作一个pandas.Dataframe来做。相反，你可以像这样使用numpy.where方法：

np.where(out_image == -5, np.NaN, out_image)

赞(0）回复(0）举报 2023-04-21

wz1wpwve3#

I was also facing same issue ,when I was storing my Data into BigInt column and to counter the issue to store Nan/Null/None into int/BigInt datatype I have used below approach.

df['column_name'] = df['column_name'].convert_dtypes()
df['column_name'] = df['column_name'].astype('Int64')

using first line code I have converted all values into float and then with below 
code I have converted back everything into Int64

you can directly jump to second part for me i have to do some other changes into my column values that's why I have used convert_dtypes()

赞(0）回复(0）举报 2023-04-21

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numpy将特定值更改为null会出现错误“ValueError：无法将浮点NaN转换为整数”

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