Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Unfortunately Perl won't interpolate a variable into the search list for <code>tr///</code>. You will have to use a regular expression instead:</p> <pre><code>use strict; use warnings; my $orf = "ATGCTAGCTAGCATAGAGCTAGCTA"; my @atgc = qw(A T G C); my %count; $count{$1}++ while $orf =~ /([@atgc])/g; printf "%s =&gt; %d\n", $_, $count{$_} for @atgc; </code></pre> <p><strong>output</strong></p> <pre><code>A =&gt; 8 T =&gt; 6 G =&gt; 6 C =&gt; 5 </code></pre> <hr> <p><strong>Beware</strong></p> <p>This isn't - as it may appear - a general solution for matching any one of an array of strings. What is happening is <code>@atcg</code> is being interpolated into the regex as if it was in a <em>double-quoted string</em>. That means Perl will use the <code>$"</code> built-in variable (set to a single space by default) to turn it into a string equivalent to <code>join $", @atgc</code>.</p> <p>So the code actually looks like</p> <pre><code>$count{$1}++ while $orf =~ /([A T G C])/g; </code></pre> <p>which will match spaces as well as the letters, and may break altogether if <code>@atgc</code> contains anything that is special inside a regex character class like <code>^</code>, <code>]</code> or <code>-</code>.</p> <p>Counting spaces unnecessarily shouldn't be a problem, but if your list may contain symbols then this isn't a solution you should be using.</p> <p>A count for every ASCII character can be written safely as</p> <pre><code>$count{$1}++ while $orf =~ /(.)/sg; </code></pre> <p>and the unwanted information in the <code>%count</code> hash can simply be ignored.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to count number of patterns using variables in tr/// operator?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USBorodin
    1. USBorodin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThat will also count spaces in the input. That canl mess up if you have "`^`", `"`]" or "`-`" in `@atgc`.
      singulars
      1. PO
      1. USikegami
    2. COWhen I use the code, I actually get everything in multiples of 4.
      singulars
      1. PO
      1. USJordan
    3. CO@Anish: you should replace your entire `foreach` loop with that line of code. My solution stands on its own. I have updated my answer to show this more clearly.
      singulars
      1. PO
      1. USBorodin
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload