ruby - 选择排序困惑

Question

我正在用 ruby​​ 进行简单的选择排序，但我正在按降序排序。这让我感到困惑，因为这适用于我的所有数据，除了一个数字。

def parallel_sort(data, labels)
    raise "unequal array lengths" if  data.length != labels.length
    temp = File.open("temp.txt", "w")
    0.upto(data.length - 2) do |i|
        max = i # largest value
        (i+1).upto(data.length - 1) { |j| max = j if data[j] > data[max] } 
        data[i], data[max], labels[i], labels[max] = data[max], data[i], labels[max], labels[i] if i != max 

        temp.puts "->", data, "\n", labels, "\n"
    end

    return [data, labels]
end

未排序的数据:

-> 26.71% 0.17% 0.65% 0.36% 0.17% 2.79% 0.04% 18.03% 0.13% 25.7% 25.18% 0.36%

迭代:

-> 26.71% 25.7% 0.65% 0.36% 0.17% 2.79% 0.04% 18.03% 0.13% 0.17% 25.18% 0.36%

-> 26.71% 25.7% 25.18% 0.36% 0.17% 2.79% 0.04% 18.03% 0.13% 0.17% 0.65% 0.36%

18.03% 在这里被跳过:

-> 26.71% 25.7% 25.18% 2.79% 0.17% 0.36% 0.04% 18.03% 0.13% 0.17% 0.65% 0.36%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.36% 0.04% 0.17% 0.13% 0.17% 0.65% 0.36%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.04% 0.17% 0.13% 0.17% 0.36% 0.36%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.36% 0.17% 0.13% 0.17% 0.04% 0.36%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.36% 0.36% 0.13% 0.17% 0.04% 0.17%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.36% 0.36% 0.17% 0.13% 0.04% 0.17%

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.36% 0.36% 0.17% 0.17% 0.04% 0.13%`

-> 26.71% 25.7% 25.18% 2.79% 18.03% 0.65% 0.36% 0.36% 0.17% 0.17% 0.13%` 0.04%

我不明白为什么 2.79% 被算作 > 18.03%

任何帮助都会很棒，谢谢!

Answer 1

看起来你是按字母顺序排序的，所以我敢打赌你排序的数据是字符串，而你希望它们是 float 。