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Building vs. Compiling (Java)
...y includes:
Generating sources (sometimes).
Compiling sources.
Compiling test sources.
Executing tests (unit tests, integration tests, etc).
Packaging (into jar, war, ejb-jar, ear).
Running health checks (static analyzers like Checkstyle, Findbugs, PMD, test coverage, etc).
Generating reports.
S...
Fastest way to extract frames using ffmpeg?
... video 38m07s long:
time ffmpeg -i input.mp4 -filter:v fps=fps=1/60 ffmpeg_%0d.bmp
1m36.029s
This takes long because ffmpeg parses the entire video file to get the desired frames.
time for i in {0..39} ; do ffmpeg -accurate_seek -ss `echo $i*60.0 | bc` -i input.mp4 -frames:v 1 period_down_$i....
What are the differences between Perl, Python, AWK and sed? [closed]
...th an ⁿ of 1,000,000 it runs in less than two seconds. time perl -E '$x=1_000_000;$_="a"x$x;$m=("a??"x$x).("a"x$x);say $_=~$m' If you run the naive one it takes more than two seconds for an ⁿ of just 25. The thing you have to realize is Perl has more regex features than those faster ones includi...
What is the difference between --save and --save-dev?
...ave-dev is used to save the package for development purpose.
Example: unit tests, minification..
--save is used to save the
package required for the application to run.
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Is there a foreach in MATLAB? If so, how does it behave if the underlying data changes?
...ing iterations, a WHILE loop may be more appropriate --- you'll be able to test the loop condition at every iteration, and set the value of the loop variable(s) as you wish:
n = 10;
f = n;
while n > 1
n = n-1;
f = f*n;
end
disp(['n! = ' num2str(f)])
Btw, the for-each loop in Java (and ...
Passing command line arguments to R CMD BATCH
...command line
$ R CMD BATCH --no-save --no-restore '--args a=1 b=c(2,5,6)' test.R test.out &
Test.R
##First read in the arguments listed at the command line
args=(commandArgs(TRUE))
##args is now a list of character vectors
## First check to see if arguments are passed.
## Then cycle through...
How can I use an array of function pointers?
...ointers.
void fun1()
{
}
void fun2()
{
}
void fun3()
{
}
void (*func_ptr[3])() = {fun1, fun2, fun3};
main()
{
int option;
printf("\nEnter function number you want");
printf("\nYou should not enter other than 0 , 1, 2"); /* because we have only 3 functions */
scanf("%d",&...
How to detect internet speed in JavaScript?
...e file size.
Example can be found here: Calculate speed using javascript
Test case applying the fix suggested there:
//JUST AN EXAMPLE, PLEASE USE YOUR OWN PICTURE!
var imageAddr = "http://www.kenrockwell.com/contax/images/g2/examples/31120037-5mb.jpg";
var downloadSize = 4995374; //bytes
...
How to Get the Current URL Inside @if Statement (Blade) in Laravel 4?
...->getName() to check your route name.
Example: routes.php
Route::get('test', ['as'=>'testing', function() {
return View::make('test');
}]);
View:
@if(Route::current()->getName() == 'testing')
Hello This is testing
@endif
...
Swapping column values in MySQL
...hem is NULL. Use method #3 that doesn't have this limitation.
UPDATE swap_test SET x=y, y=@temp WHERE (@temp:=x) IS NOT NULL;
This method was offered by Dipin in, yet again, the comments of http://beerpla.net/2009/02/17/swapping-column-values-in-mysql/. I think it’s the most elegant and clean sol...