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Why does Dijkstra's algorithm use decrease-key?
...the runtime? That depends on what priority queue you use. Here's a quick table that shows off different priority queues and the overall runtimes of the different Dijkstra's algorithm implementations:
Queue | T_e | T_d | T_k | w/o Dec-Key | w/Dec-Key
---------------+--------+--...
Compare two data.frames to find the rows in data.frame 1 that are not present in data.frame 2
...lly, setdiff(bigFrame, smallFrame) gets you the extra records in the first table.
In the SQLverse this is called a
For good descriptions of all join options and set subjects, this is one of the best summaries I've seen put together to date: http://www.vertabelo.com/blog/technical-articles/sq...
What is the most efficient Java Collections library? [closed]
...might not care about this technical detail, he wants to store data representable with ints efficiently.
First the relevant part of the code:
new Operation() {
private long usedMem() {
System.gc();
return Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
...
What characters are forbidden in Windows and Linux directory names?
...
Let's keep it simple and answer the question, first.
The forbidden printable ASCII characters are:
Linux/Unix:
/ (forward slash)
Windows:
< (less than)
> (greater than)
: (colon - sometimes works, but is actually NTFS Alternate Data Streams)
" (double quote)
/ (forward slash)
\ (backs...
Why JSF saves the state of UI components on server?
...t of codes and projects which unnecessarily duplicates the entire database table into Java's memory in flavor of a session scoped bean where Java is been used instead of SQL to filter/group/arrange the records. With ~1000 records, that would easily go over 10MB per user session.
...
How to have no pagebreak after \include in LaTeX
...ent. The others will not show up, but are considered for counters, labels, tables of contents when the corresponding aux files are included.
In other words, by using include and includeonly one can keep the compile time short in a draft while having correct references.
Further reading on Wikibooks....
Can I change a private readonly field in C# using reflection?
...am not aware of any place where we document that readonly fields must be mutable via reflection. As far as I know, a conforming implementation of the CLI is perfectly free to implement readonly fields such that they throw exceptions when mutated via reflection after the constructor is done.
...
Going from a framework to no-framework [closed]
...lasses or SQL classes.
2) I believe that MVC frameworks are not easily portable especially when using dependency managers.
3) I believe that you actually write more code with a MVC framework then if you had to use a boilerplate with a ton of useful classes that handle authentication etc.
4) Most ...
How do I parse command line arguments in Bash?
...hosts', Leftovers: foo bar
The advantages of getopts are:
It's more portable, and will work in other shells like dash.
It can handle multiple single options like -vf filename in the typical Unix way, automatically.
The disadvantage of getopts is that it can only handle short options (-h, not...
Checkstyle vs. PMD
...ll three overlap to a degree and also bring their own, unique rules to the table. This is why tools like Sonar use all three.
That said, Findbugs has the most specific or niche rules (e.g. "Dubious catching of IllegalMonitorStateException" - how often are you likely to run into that?) so it is usab...