StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

PO
primarykey
Id
8723445
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2012-01-04T07:28:58.863
FavoriteCount
0
LastActivityDate
2012-01-04T07:49:05.057
LastEditDate
2012-01-04T07:49:05.057
LastEditorUserId
977038
OwnerUserId
977038
ParentId
8723208
PostTypeId
2
Score
2
ViewCount
0
LastEditorDisplayName
text
Body
To find the number of ways to divide <code>(m+n+p)</code> items in group of <code>m,n,p</code>is first to divide the set in groups of <code>m</code> and then each of these groups divide by <code>n</code> followed by divide by <code>p</code>. Now of ways to divide (m+n+p) items in groups of (n+p) is ==> (n+m+n)Cn+p ==> (m+n+p)!/(m!*(n+p)!) Now of ways to divide (n+p) items in groups of n is ==> (n+p)Cn ==> (n+p)!/(n!*(p)!) so (n+m+n)Cm * (n+p)Cn = (m+n+p)!/(m!*(n+p)!) * (n+p)!/(n!*(p)!) ==> (m+n+p)!/(m!*n!*p!) To do the combinations we can use <a href="http://docs.python.org/library/itertools.html#itertools.combinations" rel="nofollow">itertools.combinations</a> Given m=4,n=3,p=2 Divide the Group into (n+p) = 5 items <pre><code>>>> g1=(x for x in itertools.combinations(xrange(9),5)) </code></pre> Note:: You can leave it as a generator. Divide each of these groups into subgroup of n items = 3 items <pre><code>>>> groups=[(x,tuple(set(g)-set(x))) for g in g1 for x in itertools.combinations(g,3)] </code></pre> Note:: tuple(set(g)-set(x)) would give you elements not is x i.e. the other part of the group Size of the Group is <pre><code>>>> len(groups) 1260 >>> </code></pre> Now Validate <pre><code>>>> factorial(9)/(factorial(2)*factorial(3)*factorial(4)) 1260 </code></pre>
Tags
Title
singulars
PostAcceptedAnswerId
1. This table or related slice is empty.
PostParentId
1. POmultiple coefficients with python
 singulars
 PostTypePostTypeId
 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USAbhijit
UserOwnerUserId
1. USAbhijit
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. This table or related slice is empty.
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 PO
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
CommentsPostId
1. COI think you might have missed the point. g2 should be chosen from the remaining 5?
 singulars
 PostPostId
 PO
 UserUserId
 USqed
2. CO@CravingSpirit, Sorry missed it
 singulars
 PostPostId
 PO
 UserUserId
 USAbhijit

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.