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How to map atan2() to degrees 0-360
...buse atan2()
According to the docs atan2 takes parameters y and x in that order. However if you reverse them you can do the following:
double radians = std::atan2(x, y);
double degrees = radians * 180 / M_PI;
if (radians < 0)
{
degrees += 360;
}
2) Use atan2() correctly and convert after...
How to get the filename without the extension in Java?
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Here is the consolidated list order by my preference.
Using apache commons
import org.apache.commons.io.FilenameUtils;
String fileNameWithoutExt = FilenameUtils.getBaseName(fileName);
OR
String fileNameWithOutExt = Filename...
Using ls to list directories and their total sizes
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sort -rn sorts things in reverse numerical order. sort -rn | head -n 10 will show only the top few, if that's of any interest.
– AgileTillIDie
Mar 17 '14 at 13:51
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What is the difference between Flex/Lex and Yacc/Bison?
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Why are interface variables static and final by default?
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Interfaces cannot have instance variables in order to avoid multiple inheritance of state problems. See docs.oracle.com/javase/tutorial/java/IandI/… . A class cannot extend more than one class due to the same reason.
– denis
Aug ...
MySQL search and replace some text in a field
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Highly active question. Earn 10 reputation in order to answer this question. The reputation requirement helps protect this question from spam and non-answer activity.
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Set selected index of an Android RadioGroup
...you have another UI element in your RadioGroup, or if another developer re-orders the RadioButtons, the indices might change and not be what you expected. But if you're the only developer, this is totally fine.
share
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Left Join With Where Clause
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Counting DISTINCT over multiple columns
...might expect in Oracle.
SQL> select distinct deptno, job from emp
2 order by deptno, job
3 /
DEPTNO JOB
---------- ---------
10 CLERK
10 MANAGER
10 PRESIDENT
20 ANALYST
20 CLERK
20 MANAGER
30 CLERK
30 MANAGER
30 S...
Is log(n!) = Θ(n·log(n))?
...rm and that log(n!) can therefore approximated by nlog(n) or that it is of order nlog(n) which is expressed by the big O notation O(n*log(n)).
– recipe_for_disaster
Oct 31 '19 at 18:44
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