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Cluster analysis in R: determine the optimal number of clusters
...t.obj)
css.obj <- css.hclust(dist.obj,hclust.obj)
elbow.obj <- elbow.batch(css.obj)
k <- elbow.obj$k
return(k)
}
Running Elbow parallel
no_cores <- detectCores()
cl<-makeCluster(no_cores)
clusterEvalQ(cl, library(GMD))
clusterExport(cl, list("data.clustering", "data.con...
How to check which locks are held on a table
...an we check which database locks are applied on which rows against a query batch?
6 Answers
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Interface Builder: What are the UIView's Layout iOS 6/7 Deltas for?
...e children collectively and give delta Y as -20px. You can also do this in batch or individually.
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Call method in directive controller from other controller
...n and this is the correct approach. More applications include notification queues and modal dialogs.
– Josh David Miller
Feb 14 '13 at 22:02
7
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Fundamental difference between Hashing and Encryption algorithms
...ial implementation is:
var hash = password + salt;
for (var i = 0; i < 5000; i++) {
hash = sha512(hash + password + salt);
}
There are other, more standard implementations such as PBKDF2, BCrypt. But this technique is used by quite a few security related systems (such as PGP, WPA, Apache ...
Setting environment variables via launchd.conf no longer works in OS X Yosemite/El Capitan/macOS Sie
...so env variables are registered in parallel with processing of the "reopen queue".
But actually, I reboot my system only several times per year (on big updates), so it is not a big deal.
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memory_get_peak_usage() with “real usage”
..." to "1.25 MiB" and that's what triggers the fatal error. I have a complex batch script with memory limit of 120 MiB that have "not real" allocated memory of only "80 MiB" when it is aborted because the "real" allocated memory reaches the limit.
– Martin Prikryl
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HTML5 Canvas Resize (Downscale) Image High Quality?
...ith variable quality/speed. In short, it resizes 1280*1024px in ~0.1s, and 5000*3000px image in 1s, with highest quality (lanczos filter with 3 lobes). Pica has demo, where you can play with your images, quality levels, and even try it on mobile devices.
Pica does not have unsharp mask yet, but tha...
What does Docker add to lxc-tools (the userspace LXC tools)?
.../stdin) of each process container is collected and logged for real-time or batch retrieval.
Docker provides this.
6) Change management: changes to a container's filesystem can be committed into a new image and re-used to create more containers. No templating or manual configuration required.
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Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
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Correct, this is a DFS. A BFS would need to use a queue, enqueuing level-(N+1) nodes to be processed after all level-N nodes. However, for the OP's purposes, either BFS or DFS will work, as no preferred sorting order of paths is specified.
– Matt J
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