大约有 4,400 项符合查询结果（耗时：0.0145秒） [XML]
How do I determine k when using k-means clustering?
...ering
n = 150
g = 6
set.seed(g)
d <- data.frame(x = unlist(lapply(1:g, function(i) rnorm(n/g, runif(1)*i^2))),
y = unlist(lapply(1:g, function(i) rnorm(n/g, runif(1)*i^2))))
mydata<-d
#Plot 3X2 plots
attach(mtcars)
par(mfrow=c(3,2))
#Plot the original dataset
plot(mydata$x,m...
Compare JavaScript Array of Objects to Get Min / Max
... etc.) on an array of objects, and return a single result:
myArray.reduce(function(prev, curr) {
return prev.Cost < curr.Cost ? prev : curr;
});
...or you can define that inner function with ES6 function syntax:
(prev, curr) => prev.Cost < curr.Cost ? prev : curr
If you want to be...
Why is Dictionary preferred over Hashtable in C#?
...
Fun. The Dictionary<T> source code looks a lot cleaner and faster. It might be better to use Dictionary and implement your own synchronization. If the Dictionary reads absolutely need to be current, then you'd simply ...
C# Double - ToString() formatting with two decimal places but no rounding
...
I suggest you truncate first, and then format:
double a = 123.4567;
double aTruncated = Math.Truncate(a * 100) / 100;
CultureInfo ci = new CultureInfo("de-DE");
string s = string.Format(ci, "{0:0.00}%", aTruncated);
Use the constant 100 for 2 digits truncate; use a 1 followed by a...
NoSQL Use Case Scenarios or WHEN to use NoSQL [closed]
...
AdaTheDevAdaTheDev
123k2424 gold badges179179 silver badges181181 bronze badges
...
In MySQL, how to copy the content of one table to another table within the same database?
...edited Feb 20 '15 at 7:23
Rizier123
55k1616 gold badges7777 silver badges
How to get a function name as a string?
In Python, how do I get a function name as a string, without calling the function?
12 Answers
...
How to escape double quotes in a title attribute
...#064 | at sign @
&#093 | right bracket ]
&#123 | left curly brace {
&#125 | right curly brace }
&#133 | ellipsis …
&#135 | double dagger ‡
&#146 | right single quote ’
&#148 ...
Inserting multiple rows in mysql
...ship) table :
// get data
$table_1 = get_table_1_rows();
$table_2_fk_id = 123;
// prepare first part of the query (before values)
$query = "INSERT INTO `table` (
`table_1_fk_id`,
`table_2_fk_id`,
`insert_date`
) VALUES ";
//loop the table 1 to get all foreign keys and put it in array
for...
Emulate a do-while loop in Python?
...
yes. and add more fun by renaming condition to do throughout so that the second line reads while do: :D
– SpeedCoder5
Aug 6 '18 at 17:38
...