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Big-oh vs big-theta [duplicate]
...referred over laxness of bound (i.e., bullet 1
below).
T(n) = O(n100), which is identical to T(n) ∈ O(n100)
T(n) = O(n3), which is identical to T(n) ∈ O(n3)
T(n) = Θ(n3), which is identical to T(n) ∈ Θ(n3)
The equivalent English statements are respectively:
T(n)...
Android Center text on canvas
...
+100
Center with Paint.getTextBounds():
private Rect r = new Rect();
private void drawCenter(Canvas canvas, Paint paint, String text)...
How to retrieve an element from a set without removing it?
...tune in, time it:
from timeit import Timer
stats = [
"for i in range(1000): \n\tfor x in s: \n\t\tbreak",
"for i in range(1000): next(iter(s))",
"for i in range(1000): s.add(s.pop())",
"for i in range(1000): list(s)[0]",
"for i in range(1000): random.sample(s, 1)",
]
for stat ...
转：postfix安装Q&A - 更多技术 - 清泛网 - 专注C/C++及内核技术
...berkeleyDB的开发库，或者是指定路径没有找到，所以报这个错了。如果是linux， 注意看有没有db*-devel的rpm，或者libdb*-dev的deb（debian）如果是bsd，则看看有没有装db3/db4等包
QUOTE:
Q：
按照Postfix+Cyrus-IMAP+Cyrus-SASL+...
Studies on optimal code width?
... There was enough space left for two editor windows side-by-side at around 100 characters.
I also find that the longest lines come from method calls with long parameter lists. This is sometimes a code smell: perhaps the method should be refactored.
If you & your co-programmers have high-resol...
How do I split a string so I can access item x?
...
It's elegant but only works for 100 elements because of the limit of recursion depth.
– Pking
Nov 7 '12 at 15:31
4
...
How to change the style of alert box?
...
background-color:rgba(0, 0, 0, 0.3);
position:absolute;
width:100%;
height:100%;
top:0px;
left:0px;
z-index:10000;
background-image:url(tp.png); /* required by MSIE to prevent actions on lower z-index elements */
}
#alertBox {
position:relative;
width:300px;...
MySQL maximum memory usage
...28M
thread_cache_size = 8
max_connections = 400
innodb_lock_wait_timeout = 100
for a server with the following specifications:
Dell Server
CPU cores: Two
Processor(s): 1x Dual Xeon
Clock Speed: >= 2.33GHz
RAM: 2 GBytes
Disks: 1×250 GB SATA
...
Android: How to Programmatically set the size of a Layout
...
// Changes the height and width to the specified *pixels*
params.height = 100;
params.width = 100;
layout.setLayoutParams(params);
If you want to convert dip to pixels, use this:
int height = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, <HEIGHT>, getResources().getDisplayMe...
R programming: How do I get Euler's number?
...emake()
e^10
exp(10)
# or even:
e <- sum(1/factorial(0:100))
fun stuff
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