大约有 40,000 项符合查询结果（耗时：0.0474秒） [XML]
How do I obtain the frequencies of each value in an FFT?
...
I have used the following:
public static double Index2Freq(int i, double samples, int nFFT) {
return (double) i * (samples / nFFT / 2.);
}
public static int Freq2Index(double freq, double samples, int nFFT) {
return (int) (freq / (samples / nFFT / 2.0));
}
The input...
Limit number of characters allowed in form input text field
...work fine. So say if you wanted the values to be between 1-50 you could or all positive numbers, etc.
– b3verelabs
Dec 17 '11 at 14:34
...
Use email address as primary key?
...when trying to track down data problems.
You almost certainly will need an index on the email address anyway, so making it the primary key eliminates one index, thus improving the performance of inserts as they now have only one index to update instead of two.
In my humble opinion, it's not a slam...
Removing trailing newline character from fgets() input
... Will probably throw exception if the string is empty, won't it? Like index out of range.
– Edward Olamisan
May 31 '13 at 3:26
...
SQL select only rows with max value on a column [duplicate]
... performance friendly, however your mileage may vary (RDBMS, DB Structure, Indexes, etc.). So when you pick one approach over the other, benchmark. And make sure you pick the one which make most of sense to you.
share
...
ASP.NET MVC - passing parameters to the controller
...onsider not doing ViewStockNext action and instead a ViewStock action with index. (my 2cents)
share
|
improve this answer
|
follow
|
...
How do I delete unpushed git commits?
...et HEAD~1 will also keep all your changes but will leave you with an empty index rather than keep everything (as the --soft option would).
– Holloway
Aug 27 '14 at 10:05
...
How to set Default Controller in asp.net MVC 4 & MVC 5
...hange your route. The default route (defined in your App_Start) sets /Home/Index
routes.MapRoute(
"Default", // Route name
"{controller}/{action}/{id}", // URL with parameters*
new { controller = "Home", action = "Index",
id = UrlParameter.Optional }
);
as the def...
Inserting multiple rows in a single SQL query? [duplicate]
...
@ahnbizcad Semicolons in T-sql are USUALLY optional, but they are reported to be required in the future. You should get yourself in the habit of using them to terminate each statement--your code will look nicer too IMO.
– NReilingh
...
Convert text into number in MySQL query
...
This should work:
SELECT field,CONVERT(SUBSTRING_INDEX(field,'-',-1),UNSIGNED INTEGER) AS num
FROM table
ORDER BY num;
share
|
improve this answer
|
...