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Copy folder structure (without files) from one location to another
...xceed the maximum command length of the system when you start dealing with orders of hundreds or thousands, so use this with caution. (Find the command length limit with getconf ARG_MAX.) With a lot of directories, you may have to write a script to loop through the output instead.
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Difference between HBase and Hadoop/HDFS
...ou just need to make sure that you are using HBase as it should be used in order to get maximum performance
– Tariq
Feb 25 '16 at 7:49
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Is there a performance difference between i++ and ++i in C?
...++i is the "semantic" way to use a unary operator, while i++ is around in order to fit a specific need (evaluation before addition).
– TM.
Aug 12 '09 at 21:55
9
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Redirecting Output from within Batch file
...amp;8 File 2 message 2
exit /b
I chose to use handles 9 and 8 in reverse order because that way is more likely to avoid potential permanent redirection due to a Microsoft redirection implementation design flaw when performing multiple redirections on the same command. It is highly unlikely, but ev...
The Guava library: What are its most useful and/or hidden features? [closed]
...g collection mapped to a key and creating and adding it if it isn't there.
Ordering is great for building Comparators that behave just how you want.
Maps.uniqueIndex and Multimaps.index: these methods take an Iterable and a Function and build an ImmutableMap or ImmutableListMultimap that indexes th...
Facebook App: localhost no longer works as app domain
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Solution using Firebase
In order to get this working on localhost, port 3000 I did the following:
Create App
Now Select "+ Create Test App" from the arrow dropdown (top left).
Add localhost to App Domains
Add http://localhost:3000/ to ...
How to prettyprint a JSON file?
...mend using python3 -m json.tool <IN >OUT, as this keeps the original order of the fields in JSON dicts. The python interpreter version 2 sorts the fields in alphabetically ascending order, which often is not, what you want.
– Kai Petzke
Jan 20 '19 at 17:0...
Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?
...The extra session was removed by simply rearranging the express middleware order. On another note, this needs a little more security. if the origin is not in the allowed domain then the request is still processed, only the browser won't be able to see it plus the origin can be spoofed. My advice wou...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
...or the OP's purposes, either BFS or DFS will work, as no preferred sorting order of paths is specified.
– Matt J
Oct 21 '08 at 17:25
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Principal component analysis in Python
....dinv: 1/d or 0, see NR
p.eigen: the eigenvalues of A*A, in decreasing order (p.d**2).
eigen[j] / eigen.sum() is variable j's fraction of the total variance;
look at the first few eigen[] to see how many PCs get to 90 %, 95 % ...
p.npc: number of principal components,
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