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Cluster analysis in R: determine the optimal number of clusters
...tml for more. The location of the elbow in the resulting plot suggests a suitable number of clusters for the kmeans:
mydata <- d
wss <- (nrow(mydata)-1)*sum(apply(mydata,2,var))
for (i in 2:15) wss[i] <- sum(kmeans(mydata,
centers=i)$withinss)
plot(...
Better techniques for trimming leading zeros in SQL Server?
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edited Sep 23 '13 at 7:11
Justin
8,93166 gold badges2828 silver badges4242 bronze badges
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Where do you store your salt strings?
... in advance and distributed en masse to save calculation time for others - it takes just as long to generate rainbow tables on the fly as it would to just crack the password+salt combination directly (since effectively what's being done when generating rainbow tables is pre-running the calculations ...
How to select rows that have current day's timestamp?
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edited Feb 8 '13 at 9:39
answered Feb 8 '13 at 9:07
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How can I retrieve Id of inserted entity using Entity framework? [closed]
I have a problem with Entity Framework in ASP.NET. I want to get the Id value whenever I add an object to database. How can I do this?
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How to go back in Eclipse?
...y to retrace a step? If my code calls a method and I go to the method definition, is there a key combination that will take me back to the calling code?
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How to order by with union in SQL?
Is it possible to order when the data is come from many select and union it together? Such as
8 Answers
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Remove Fragment Page from ViewPager in Android
...ng to dynamically add and remove Fragments from a ViewPager, adding works without any problems, but removing doesn't work as expected.
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Addressing localhost from a VirtualBox virtual machine [closed]
...is up: http://data.agaric.com/localhost-from-virtualbox-xp-install-ubuntu
It suggests using IP: http://10.0.2.2, and it worked for me.
So, I edited the hosts file, C:\windows\system32\drivers\etc\hosts, and added this entry:
10.0.2.2 outer
If you're testing on IE8, remember to put http:// in...
How can I use map and receive an index as well in Scala?
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I believe you're looking for zipWithIndex?
scala> val ls = List("Mary", "had", "a", "little", "lamb")
scala> ls.zipWithIndex.foreach{ case (e, i) => println(i+" "+e) }
0 Mary
1 had
2 a
3 little
4 lamb
From: http://www.artima.com/forums/flat.jsp?f...