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Looking for a good world map generation algorithm [closed]
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You could use a modification of K-means clustering to determine which 'continent' each individual piece of land was owned by. Then use a Voronoi diagram (which should be easy once you have the clusters defined) to determine the plate boundaries... for each l...
Database sharding vs partitioning
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Am I right in thinking horizontal partitioning just means split rows out of a table into several sub-tables (possibly within the same schema or database instance.) While sharding is to horizontally partition, putting the sub-tables into separate schemas within a single databas...
Is the 'override' keyword just a check for a overridden virtual method?
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That's indeed the idea. The point is that you are explicit about what you mean, so that an otherwise silent error can be diagnosed:
struct Base
{
virtual int foo() const;
};
struct Derived : Base
{
virtual int foo() // whoops!
{
// ...
}
};
The above code compiles, but ...
Creating an Android trial application that expires after a fixed time period
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What is meant by hardcode end date of trial? Does that mean you will keep releasing new versions of the trial app forever with different hardcoded dates into the future?
– Jasper
May 21 '15 at 1...
_DEBUG vs NDEBUG
...defined simply as
#define assert(ignore) ((void)0)
If look at the meaning of _DEBUG macros in Visual Studio
https://msdn.microsoft.com/en-us/library/b0084kay.aspx
then it will be seen, that this macro is automatically defined by your сhoice of language runtime library version.
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Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation '=
...ly, Option 4 is the best option for very large tables when it is viable. I mean there are no other usage that rely on the original collation.
Consider this simplified query:
SELECT
*
FROM
schema1.table1 AS T1
LEFT JOIN
schema2.table2 AS T2 ON T2.CUI = T1.CUI
WHERE
T1.cui I...
In R, how to get an object's name after it is sent to a function?
...ubstitute trick:
a<-data.frame(x=1:10,y=1:10)
test<-function(z){
mean.x<-mean(z$x)
nm <-deparse(substitute(z))
print(nm)
return(mean.x)}
test(a)
#[1] "a" ... this is the side-effect of the print() call
# ... you could have done something useful with that charact...
Xml Namespace breaking my xpath! [duplicate]
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@36305 ah okay, this means I can use it like /*[local-name()="mynode" and @myAttr="value"]?
– Kajetan Jauk
Mar 6 '19 at 13:59
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How to concatenate columns in a Postgres SELECT?
... FROM foo;
Judging from your own answer, "does not work" was supposed to mean "returns NULL". The result of anything concatenated to NULL is NULL. If NULL values can be involved and the result shall not be NULL, use concat_ws() to concatenate any number of values (Postgres 9.1 or later):
SELECT c...
What is the difference between Digest and Basic Authentication?
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@Andy what do you mean by "decode the credentials"? Hashed credentials can't be decoded...
– Alexander Suraphel
Oct 20 '14 at 15:55
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