大约有 44,000 项符合查询结果（耗时：0.0773秒） [XML]
What is “entropy and information gain”?
...-1)/2) = prob_array(diff+(array_size-1)/2) + 1
endif
endfor
//Convert values in prob_array to probabilities and compute entropy
n = total(prob_array)
entrop = 0
for i = 0, array_size-1 do begin
prob_array(i) = prob_array(i)/n
//Base 2 log of x is Ln(x)/Ln(2). Take Ln of array ...
Modify table: How to change 'Allow Nulls' attribute from not null to allow null
... then you will need to perform separate ALTER TABLE .. ALTER COLUMN .. commands
– sonyisda1
Feb 17 '17 at 15:14
...
How to remove leading zeros from alphanumeric text?
... "]");
}
See also
regular-expressions.info
repetitions, lookarounds, and anchors
String.replaceFirst(String regex)
share
|
improve this answer
|
follow
...
Remove all whitespaces from NSString
...stringByTrimmingCharactersInSet only removes characters from the beginning and the end of the string, not the ones in the middle.
1) If you need to remove only a given character (say the space character) from your string, use:
[yourString stringByReplacingOccurrencesOfString:@" " withString:@""]
...
Auto increment in phpmyadmin
I have an existing database using PHP, MySQL and phpMyAdmin.
9 Answers
9
...
C# Double - ToString() formatting with two decimal places but no rounding
...te(myDoubleValue * 100) / 100;
For instance:
If the number is 50.947563 and you use the following, the following will happen:
- Math.Truncate(50.947563 * 100) / 100;
- Math.Truncate(5094.7563) / 100;
- 5094 / 100
- 50.94
And there's your answer truncated, now to format the string simply do the...
How to find SQL Server running port?
... answered Sep 6 '12 at 10:04
AnandPhadkeAnandPhadke
11.8k44 gold badges2222 silver badges3333 bronze badges
...
Multiple INSERT statements vs. single INSERT with multiple VALUES
...
I ran into a similar situation trying to convert a table with several 100k rows with a C++ program (MFC/ODBC).
Since this operation took a very long time, I figured bundling multiple inserts into one (up to 1000 due to MSSQL limitations). My guess that a lot of sin...
How to show the loading indicator in the top status bar
I have noticed that some apps like Safari and Mail show a loading indicator in the status bar (the bar at the very top of the phone) when they are accessing the network. Is there a way to do the same thing in SDK apps, or is this an Apple only thing?
...
Running Command Line in Java [duplicate]
Is there a way to run this command line within a Java application?
8 Answers
8
...