大约有 47,000 项符合查询结果（耗时：0.0459秒） [XML]
Random Gaussian Variables
...rand = new Random(); //reuse this if you are generating many
double u1 = 1.0-rand.NextDouble(); //uniform(0,1] random doubles
double u2 = 1.0-rand.NextDouble();
double randStdNormal = Math.Sqrt(-2.0 * Math.Log(u1)) *
Math.Sin(2.0 * Math.PI * u2); //random normal(0,1)
double randNormal =...
How to indicate param is optional using inline JSDoc?
...
answered Apr 4 '15 at 0:39
czernyczerny
10.1k1212 gold badges5454 silver badges7575 bronze badges
...
How to get min/max of two integers in Postgres/SQL?
...
306
Have a look at GREATEST and LEAST.
UPDATE my_table
SET my_column = GREATEST(my_column - 10, 0)...
How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
Given a ['0','1','1','2','3','3','3'] array, the result should be ['0','1','2','3'] .
17 Answers
...
What Regex would capture everything from ' mark to the end of a line?
...
answered May 6 '09 at 17:59
Joshua BeldenJoshua Belden
8,86755 gold badges3232 silver badges5151 bronze badges
...
Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
...Let's say you have 4 cores:
With IRIX mode on, 1 fully utilized core is 100% and 4 cores are 400%.
With IRIX mode off, 1 fully utilized core is 25% and 4 cores are 100%.
This means that by default, top on Linux will show an infinite loop as ~100% and Windows will show it as ~25%, and it means ...
Preventing Laravel adding multiple records to a pivot table
...te/…
– Rob Gordijn
Jul 5 '13 at 8:08
...
How do I test if a variable is a number in Bash?
...
One approach is to use a regular expression, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
....
How to extract a string using JavaScript Regex?
... of the
whole input string)
Also put the * in the right place:
"DATE:20091201T220000\r\nSUMMARY:Dad's birthday".match(/^SUMMARY\:(.*)$/gm);
//------------------------------------------------------------------^ ^
//-----------------------------------------------------------------------|
...
How to calculate time elapsed in bash script?
...
20 Answers
20
Active
...