StackOverflow2013

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plurals

PO
primarykey
Id
5110486
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
0
CommunityOwnedDate
CreationDate
2011-02-24T21:06:45.807
FavoriteCount
0
LastActivityDate
2011-02-24T21:25:28.753
LastEditDate
2011-02-24T21:25:28.753
LastEditorUserId
429846
OwnerUserId
429846
ParentId
5110027
PostTypeId
2
Score
3
ViewCount
0
LastEditorDisplayName
text
Body
One option is to use <code>outer()</code> to apply the binary operator function <code>></code> to <code>a</code> and <code>b</code>: <pre><code>> outer(a, b, ">") [,1] [,2] [,3] [,4] [,5] [1,] FALSE FALSE FALSE FALSE FALSE [2,] FALSE FALSE TRUE FALSE TRUE [3,] TRUE FALSE TRUE TRUE TRUE [4,] TRUE FALSE TRUE TRUE TRUE [5,] TRUE TRUE TRUE TRUE TRUE [6,] TRUE TRUE TRUE TRUE TRUE [7,] FALSE FALSE TRUE FALSE TRUE </code></pre> The answer to the Q is then given by the row sums of the result above: <pre><code>> rowSums(outer(a, b, ">")) [1] 0 2 4 4 5 5 2 </code></pre> For this example data set, this solution is slightly faster that <code>findIntervals()</code> but not by much: <pre><code>> system.time(replicate(1000, findInterval(a - 0.5, sort(b)))) user system elapsed 0.131 0.000 0.132 > system.time(replicate(1000, rowSums(outer(a, b, ">")))) user system elapsed 0.078 0.000 0.079 </code></pre> It is also slightly faster than the <code>sapply()</code> version, but marginally: <pre><code>> system.time(replicate(1000, sapply(a, function(x)sum(b<x)))) user system elapsed 0.082 0.000 0.082 </code></pre> @Charles notes that most of the time in the <code>findInterval()</code> example is used by <code>sort()</code>, which can be circumvented via <code>order()</code>. When this is done, the <code>findInterval()</code> solution is faster than the <code>outer()</code> solution: <pre><code>> system.time(replicate(1000, findInterval(a - 0.5, b[order(b)]))) user system elapsed 0.049 0.000 0.049 </code></pre>
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Title
singulars
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1. This table or related slice is empty.
PostParentId
1. POOptimal method of comparing a vector of numbers to values in another vector
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 PTQuestion
PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USGavin Simpson
UserOwnerUserId
1. USGavin Simpson
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1. VO
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 VTUpMod
2. VO
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3. VO
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1. This table or related slice is empty.

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