大约有 44,600 项符合查询结果（耗时：0.0288秒） [XML]
map function for objects (instead of arrays)
...
1
2
Next
1675
...
How to calculate an angle from three points? [closed]
... is the vertex of then using the Law of Cosines should work:
arccos((P122
+ P132 - P232) / (2 *
P12 * P13))
where P12 is the length of the segment from P1 to P2, calculated by
sqrt((P1x -
P2x)2 +
(P1y -
P2y)2)
...
Installing SetupTools on 64-bit Windows
I'm running Python 2.7 on Windows 7 64-bit, and when I run the installer for setuptools it tells me that Python 2.7 is not installed. The specific error message is:
...
Why does changing 0.1f to 0 slow down performance by 10x?
...
1627
Welcome to the world of denormalized floating-point! They can wreak havoc on performance!!!
De...
Cast List to List in .NET 2.0
...
.NET 2.0 has the ConvertAll method where you can pass in a converter function:
List<int> l1 = new List<int>(new int[] { 1, 2, 3 } );
List<string> l2 = l1.ConvertAll<string>(delegate(int i) { return i.To...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
...
1
2
Next
6173
...
How to map and remove nil values in Ruby
...
27
Ruby 2.7+
There is now!
Ruby 2.7 is introducing filter_map for this exact purpose. It's idiom...
How to merge dictionaries of dictionaries?
...
29 Answers
29
Active
...
How many characters can UTF-8 encode?
If UTF-8 is 8 bits, does it not mean that there can be only maximum of 256 different characters?
10 Answers
...
Convert a float64 to an int in Go
...
213
package main
import "fmt"
func main() {
var x float64 = 5.7
var y int = int(x)
fmt.Print...