Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Generalized to n-grams with optional padding, also uses <code>defaultdict(int)</code> for frequencies, to work in 2.6:</p> <pre><code>from collections import defaultdict def ngrams(words, n=2, padding=False): "Compute n-grams with optional padding" pad = [] if not padding else [None]*(n-1) grams = pad + words + pad return (tuple(grams[i:i+n]) for i in range(0, len(grams) - (n - 1))) # grab n-grams words = ['the','cat','sat','on','the','dog','on','the','cat'] for size, padding in ((3, 0), (4, 0), (2, 1)): print '\n%d-grams padding=%d' % (size, padding) print list(ngrams(words, size, padding)) # show frequency counts = defaultdict(int) for ng in ngrams(words, 2, False): counts[ng] += 1 print '\nfrequencies of bigrams:' for c, ng in sorted(((c, ng) for ng, c in counts.iteritems()), reverse=True): print c, ng </code></pre> <p>Output:</p> <pre><code>3-grams padding=0 [('the', 'cat', 'sat'), ('cat', 'sat', 'on'), ('sat', 'on', 'the'), ('on', 'the', 'dog'), ('the', 'dog', 'on'), ('dog', 'on', 'the'), ('on', 'the', 'cat')] 4-grams padding=0 [('the', 'cat', 'sat', 'on'), ('cat', 'sat', 'on', 'the'), ('sat', 'on', 'the', 'dog'), ('on', 'the', 'dog', 'on'), ('the', 'dog', 'on', 'the'), ('dog', 'on', 'the', 'cat')] 2-grams padding=1 [(None, 'the'), ('the', 'cat'), ('cat', 'sat'), ('sat', 'on'), ('on', 'the'), ('the', 'dog'), ('dog', 'on'), ('on', 'the'), ('the', 'cat'), ('cat', None)] frequencies of bigrams: 2 ('the', 'cat') 2 ('on', 'the') 1 ('the', 'dog') 1 ('sat', 'on') 1 ('dog', 'on') 1 ('cat', 'sat') </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POCounting bi-gram frequencies
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USsamplebias
    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. This table or related slice is empty.
    1. This table or related slice is empty.
 

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