'做些什么'如果密钥存在于hash1中而不存在于hash2中

问题描述

我写了一些代码，可以在3个不同的HoA中找到重叠的键，这些键包含我稍后对它们进行排序的一些信息：

 ＃！/ usr / bin / perl 
使用警告; 
使用strict; 
 
 my @intersect; 
 for $ key（sort key％hash1）{
 if（exists $ hash2 {$ key}&& $ hash3 {$ key}）{
 my（$ hit1，$ percent_id1）= @ {$ hash1 {$ key} [ -  1]}; 
 my（$ hit2，$ percent_id2）= @ {$ hash2 {$ key} [ -  1]}; 
 my（$ hit3，$ percent_id3）= @ {$ hash3 {$ key} [ -  1]}; 
 push @intersect，$ key \ tC1：[$ condition1] $ hit1 [$ percent_id1] \tC2：[$ condition2] $ hit2 [$ percent_id2] \tC3：[$ condition3] $ hit3 [ $ percent_id3] \\\
\\\
; \\\
; 
} 
} 
  

我试图修改脚本以查找存在于以下位置的键：

• hash1和hash2，但不是hash3


• hash2和hash3，但不是hash1


• hash1和hash3，但不是hash2

我正在使用它（例如，用于第一个实例）：

  elsif（exists $ hash2 {$ key}&&！exists $ hash3 {$ key}）{＃这是指定'不存在'的正确方法吗？
 my（$ hit1，$ percent_id1）= @ {$ blast1 {$ key} [ -  1]}; 
 my（$ hit2，$ percent_id2）= @ {$ blast2 {$ key} [ -  1]}; 
 push @intersect，$ key \\ \\ tC1：[$ condition1] $ hit1 [$ percent_id1] \ tC2：[$ condition2] $ hit2 [$ percent_id2] \ n; 
} 
  

稍后在代码中循环t通过每个 @intersect 来排序它们（下面的细节很大程度上是不相关的）：

  foreach（@intersect）{
 chomp; 
 my（@ condition1_match）=（$ _ =〜/C1:.*?Change:(-?\d+\.\d+|-?inf)/）; 
 @ q_value1 =（$ _ =〜/C1:.*?q:(\d+\.\d+)/）; 
 my（@percent_id）=（$ _ =〜/C\d+:.*\[(\d+\.\d+)\]/）; 
推送@percentages，@ percent_id％; 
 my（@ condition2_match）=（$ _ =〜/C2:.*?Change:(-?\d+\.\d+|-?inf)/）; 
 @ q_value2 =（$ _ =〜/C2:.*?q:(\d+\.\d+)/）; 
 my（@ condition3_match）=（$ _ =〜/C3:.*?Change:(-?\d+\.\d+|-?inf)/）; 
 @ q_value3 =（$ _ =〜/C3:.*?q:(\d+\.\d+)/）; 
 
 my $ condition1_match = $ condition1_match [0] // $ condition1_match [1]; 
 my $ condition2_match = $ condition2_match [0] // $ condition2_match [1]; 
 my $ condition3_match = $ condition3_match [0] // $ condition3_match [1]; （abs $ condition1_match> abs $ condition2_match&& abs $ condition1_match> abs $ condition3_match）{
 push @largest_change，$ condition1_match; 
 
; 
} 
 elsif（abs $ condition2_match> abs $ condition1_match&& abs $ condition2_match> abs $ condition3_match）{
 push @largest_change，$ condition2_match; 
} 
 else {push @largest_change，$ condition3_match} 
  

显然在如果一个键存在于两个而不是三个哈希中，会有很多变量为undef的实例，因此我得到了很多在...中使用未初始化的值 $ b

我应该在每个变量前加上 if（defined（$ variable）） ??

解决方案

  my％seen; （％hash1），键（％hash2），键（％hash3）; 
 ++ $见过{$ _} 
 for（keys（％seen））{
 next if $ seen {$ _}！= 2; 
 print（$ _被发现在两个哈希中\\\
）; 
} 
  

此版本可追踪钥匙来自何处：

  my％seen; 
为键（％hash1）推送@ {$ seen {$ _}}，'hash1'; 
为键（％hash2）推送@ {$ seen {$ _}}，'hash2'; 
为键（％hash3）推送@ {$ seen {$ _}}，'hash3'; 
 for（keys（％seen））{
 next if @ {$ seen {$ _}}！= 2; 
 print（$ _ found in @ {$ seen {$ _}} \\\
）; 
} 
  

I've written some code that finds overlapping keys in 3 different HoAs that contain some information on which I sort them later:

#!/usr/bin/perl
use warnings;
use strict;

my @intersect;
for my $key (sort keys %hash1) {
    if (exists $hash2{$key} && $hash3{$key} ) {
        my ($hit1, $percent_id1) = @{ $hash1{$key}[-1] };
        my ($hit2, $percent_id2) = @{ $hash2{$key}[-1] };
        my ($hit3, $percent_id3) = @{ $hash3{$key}[-1] };
        push @intersect, "$key\tC1:[$condition1]$hit1 [$percent_id1]\tC2:[$condition2]$hit2 [$percent_id2]\tC3:[$condition3]$hit3 [$percent_id3]\n\n";\n";
    }
}

I'm trying to adapt the script to also find keys that exist in:

• hash1 and hash2, but not hash3
• hash2 and hash3, but not hash1
• hash1 and hash3, but not hash2

For which I'm using (e.g. for the first instance):

elsif (exists $hash2{$key} && !exists $hash3{$key} ) { # Is this the right way to specify a 'not exists'?
    my ($hit1, $percent_id1) = @{ $blast1{$key}[-1] };
    my ($hit2, $percent_id2) = @{ $blast2{$key}[-1] };
    push @intersect, "$key\tC1:[$condition1]$hit1 [$percent_id1]\tC2:[$condition2]$hit2 [$percent_id2]\n";
}

Later in the code I loop through each @intersect in order to rank them (the details of what's going on below are largely irrelevant):

foreach (@intersect) {
    chomp;
    my (@condition1_match) = ($_ =~ /C1:.*?Change:(-?\d+\.\d+|-?inf)/);
    @q_value1 = ($_ =~ /C1:.*?q:(\d+\.\d+)/);
    my (@percent_id) = ($_ =~ /C\d+:.*\[(\d+\.\d+)\]/);
    push @percentages, "@percent_id%";
    my (@condition2_match) = ($_ =~ /C2:.*?Change:(-?\d+\.\d+|-?inf)/);
    @q_value2 = ($_ =~ /C2:.*?q:(\d+\.\d+)/);
    my (@condition3_match) = ($_ =~ /C3:.*?Change:(-?\d+\.\d+|-?inf)/);
    @q_value3 = ($_ =~ /C3:.*?q:(\d+\.\d+)/);

    my $condition1_match = $condition1_match[0] // $condition1_match[1];
    my $condition2_match = $condition2_match[0] // $condition2_match[1];
    my $condition3_match = $condition3_match[0] // $condition3_match[1];

    if (abs $condition1_match > abs $condition2_match && abs $condition1_match > abs $condition3_match) {
            push @largest_change, $condition1_match;
        }
        elsif (abs $condition2_match > abs $condition1_match && abs $condition2_match > abs $condition3_match) {
            push @largest_change, $condition2_match;
        }
        else { push @largest_change, $condition3_match}

Obviously in the case where a key exists in two, but not three hashes, there will be a lot of instances where variables are undef, and as such I get a lot of Use of uninitialized value in...

Should I be prefixing each variable with if (defined ($variable )) ??

解决方案

my %seen;
++$seen{$_} for keys(%hash1), keys(%hash2), keys(%hash3);
for (keys(%seen)) {
   next if $seen{$_} != 2;
   print("$_ is found in exactly two hashes\n");
}

This version tracks where the keys came from:

my %seen;
push @{ $seen{$_} }, 'hash1' for keys(%hash1);
push @{ $seen{$_} }, 'hash2' for keys(%hash2);
push @{ $seen{$_} }, 'hash3' for keys(%hash3);
for (keys(%seen)) {
   next if @{ $seen{$_} } != 2;
   print("$_ found in @{ $seen{$_} }\n");
}

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