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Cluster analysis in R: determine the optimal number of clusters
...y = unlist(lapply(1:g, function(i) rnorm(n/g, runif(1)*i^2))))
plot(d)
One. Look for a bend or elbow in the sum of squared error (SSE) scree plot. See http://www.statmethods.net/advstats/cluster.html & http://www.mattpeeples.net/kmeans.html for more. The location of the elbow in the resultin...
What is the best way to convert an array to a hash in Ruby
In Ruby, given an array in one of the following forms...
11 Answers
11
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How to use gitignore command in git
...it rm --cached doc/*
If you don't already have a .gitignore, you can make one right inside of your project folder: project/.gitignore.
Put doc/* in the .gitignore
Stage the file to commit: git add project/.gitignore
Commit: git commit -m "message".
Push your change to github.
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Was PreferenceFragment intentionally excluded from the compatibility package?
...rection is to use PreferenceFragment on Android 3.0 and higher.
Can anyone tell me whether this was intentional?
My guess is it's a question of engineering time, but that's just a guess.
If so, can I easily target a range of devices (i.e. < 3.0 and >=3.0) or will I have to jump thr...
How do I use valgrind to find memory leaks?
...ory and forget to assign the pointer.
Don't overwrite a pointer with a new one unless the old memory is freed.
General advice for memory errors:
Access and write to addresses and indices you're sure belong to you. Memory
errors are different from leaks; they're often just IndexOutOfBoundsExcepti...
Configuring IntelliJ IDEA for unit testing with JUnit
... on mac, the mapping gives me thumbnails. pretty sure that's not the right one.
– dtc
Jun 7 '19 at 19:47
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How To: Execute command line in C#, get STD OUT results
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There one other parameter I found useful, which I use to eliminate the process window
pProcess.StartInfo.CreateNoWindow = true;
this helps to hide the black console window from user completely, if that is what you desire.
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Callback functions in Java
... but there are many others in the package java.util.function. Most notable ones are
Supplier: void -> A
Consumer: A -> void
BiConsumer: (A,B) -> void
Function: A -> B
BiFunction: (A,B) -> C
and many others that specialize on some of the input/output type. Then, if it doesn't provide...
How to use a filter in a controller?
...zlowski.opensource is better than this because it reduces "magic strings". One benefit - what if this was in a much more complex controller and you failed to unit test the filter being used? You wouldn't notice the error if you use $filter('filtter1') (2 t's). However, if you inject filtter1Filter A...
When and why will a compiler initialise memory to 0xCD, 0xDD, etc. on malloc/free/new/delete?
...allocation/deallocation routines with the regular
ones.
0xFD Fence Memory Also known as "no mans land." This is used to wrap
the allocated memory (surrounding it with a fence)
and is used to detect indexing arrays o...