如何将正负十进制数列表标准化到特定范围 [英] How to normalize a list of positive and negative decimal number to a specific range

问题描述

我有一个十进制数字列表，如下所示:

I have a list of decimal numbers as follows:

[-23.5, -12.7, -20.6, -11.3, -9.2, -4.5, 2, 8, 11, 15, 17, 21]

我需要规范化此列表以适合范围[-5,5].
我该如何在python中做到这一点?

I need to normalize this list to fit into the range [-5,5].
How can I do it in python?

推荐答案

获取输入范围非常简单:

To get the range of input is very easy:

old_min = min(input)
old_range = max(input) - old_min

这是棘手的部分.您可以乘以新范围，再除以旧范围，但这几乎可以保证顶级存储桶只会在其中获得一个值.您需要扩展输出范围，以使顶部存储区的大小与所有其他存储区的大小相同.

Here's the tricky part. You can multiply by the new range and divide by the old range, but that almost guarantees that the top bucket will only get one value in it. You need to expand your output range so that the top bucket is the same size as all the other buckets.

new_min = -5
new_range = 5 + 0.9999999999 - new_min
output = [int((n - old_min) / old_range * new_range + new_min) for n in input]

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