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How to wait for all goroutines to finish without using time.Sleep?
... need any data to be passed, so use an empty struct
for i := 0; i < 100; i++ {
go func() {
doSomething()
c <- struct{}{} // signal that the routine has completed
}()
}
// Since we spawned 100 routines, receive 100 messages.
for i := 0; i...
UIViewContentModeScaleAspectFill not clipping
I'm trying to draw some thumbnail images at a fixed size (100x100) using UIImageView . I've set the frame size of my image view to be 100x100, and set the contentMode to UIViewContentModeScaleAspectFill .
...
CGContextDrawImage draws image upside down when passed UIImage.CGImage
... is in the lower left corner. So when Quartz draws pixel x[5], y[10] of a 100 * 100 image, that pixel is being drawn in the lower left corner instead of the upper left. Thus causing the 'flipped' image.
The x co-ordinate system matches, so you will need to flip the y co-ordinates.
CGContextTrans...
Find nearest value in numpy array
... sorted array then the bisection code (given below) performs the fastest. ~100-1000 times faster for large arrays, and ~2-100 times faster for small arrays. It does not require numpy either.
If you have an unsorted array then if array is large, one should consider first using an O(n logn) sort and ...
Where can I find a list of scopes for Google's OAuth 2.0 API? [closed]
...o Sacco's links, I was able to find:
https://www.googleapis.com/discovery/v1/apis/oauth2/v2/rest?fields=auth(oauth2(scopes))
It says these are the scopes available:
- https://www.googleapis.com/auth/plus.me (Know who you are on Google)
- https://www.googleapis.com/auth/userinfo.email (View your...
Maximum length of the textual representation of an IPv6 address?
...t two groups can be written in base 10 separated by ., eg. [::ffff:192.168.100.228]. Written out fully:
0000:0000:0000:0000:0000:ffff:192.168.100.228
(6 * 4 + 5) + 1 + (4 * 3 + 3) = 29 + 1 + 15 = 45
Note, this is an input/display convention - it's still a 128 bit address and for storage it w...
How do I automatically update a timestamp in PostgreSQL
...ULT value:
CREATE TABLE users (
id serial not null,
firstname varchar(100),
middlename varchar(100),
lastname varchar(100),
email varchar(200),
timestamp timestamp default current_timestamp
)
Note that the value for that column can explicitly be overwritten by supplying a value in the...
unix - head AND tail of file
... Sorry to say, but the answer only works in some cases. seq 100 | (head; tail) gives me only first 10 numbers. Only on much larger input size (like seq 2000) the tail gets some input.
– modular
Sep 21 '16 at 18:57
...
StackOverflow程序员推荐：每个程序员都应读的30本书 - 杂谈 - 清泛网 - 专...
...心理层面。其他书籍则处理算法。这些书都有自己所属的位置。
然而《计算机程序的构造和解释》与这些不同。这是一本会启发你的书，它会燃起你编写出色程序的热情；它还将教会你认识并欣赏美；它会让你有种敬畏，让你...