python - 通过Python查找列表中特定位置的绝对最大值或最小值

Question

我有一个数组列表，如下所示:

data = [([-1.01201792,  2.5,  0.68665077]), ([-2.5,  0.5,  2.68189991]), ([-2.5,  3.5, 5.92202221]), ([-2.5, 5.5, 10.19026759]), ([-2.5, 6.5, 15.30091085])]

我试图获取每个数组的绝对最大值，而不考虑数组中的第二个值。例如，在第一个数组中:([-1.01201792, 2.5, 0.68665077])，在不考虑 2.5 的情况下，绝对最大值为 1.01201792。

我希望结果是这样的:

result = [1.01201792, 2.68189991, 5.92202221, 10.19026759, 15.30091085]

我怎样才能实现这个目标？

Answer 1

您应该像编写步骤一样进行编码:

outlist = []                          # create an empty output list
for x in data:                        # for each sublist in data
    val = max(abs(x[0]), abs(x[2]))   # find max of absolute of 1st and 3rd
    outlist.append(val)               # add above value to output list

print(outlist)                        # print the output list

输出:

[1.01201792, 2.68189991, 5.92202221, 10.19026759, 15.30091085]

如果子列表中可能有超过3个元素，可以使用以下内容:

outlist = []                        # create an empty output list
for x in data:                      # for each sublist in data
    x = [x[0]]+x[2:]                # create a new list without 2nd element
    val = max(x)                    # find max of new list
    outlist.append(val)             # add above value to output list

print(outlist)                      # print the output list