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Big-oh vs big-theta [duplicate]
It seems to me like when people talk about algorithm complexity informally, they talk about big-oh. But in formal situations, I often see big-theta with the occasional big-oh thrown in.
I know mathematically what the difference is between the two, but in English, in what situation would using big-oh...
Delete all local changesets and revert to tree
...scendants.
Note that you may have to first enable strip in your Mercurial settings.
PS: an even smarter approach is to use the revset language, and do:
% hg strip 'roots(outgoing())'
share
|
imp...
Pandas: Looking up the list of sheets in an excel file
...ry directory with the file name
directory_to_extract_to = os.path.join(settings.MEDIA_ROOT, file_name)
os.mkdir(directory_to_extract_to)
# Extract the xlsx file as it is just a zip file
zip_ref = zipfile.ZipFile(file_path, 'r')
zip_ref.extractall(directory_to_extract_to)
zip...
Why are these numbers not equal?
...ution about unequal cut intervals. @ I
used the round function in R. By setting the option to 2 digits, did
not solved the problem.
options(digits = 2)
cbind(
seq( from = 1, to = 9, by = 1 ),
cut( seq( from = 1, to = 9, by = 1), c( 0, 3, 6, 9 ) ),
seq( from = 0.1, to...
Push existing project into Github
...a php project. Let's say that you have the index.php, contact.php and an assets folder with images, css, and fonts. You can do it this way (easy), but there are many options:
Option 1
Login to your github account and create the repo.
In the following screen you can copy it down where you need it i...
Difference between `set`, `setq`, and `setf` in Common Lisp?
What is the difference between "set", "setq", and "setf" in Common Lisp?
6 Answers
6
...
How to import multiple .csv files at once?
... try the following:
temp = list.files(pattern="*.csv")
list2env(
lapply(setNames(temp, make.names(gsub("*.csv$", "", temp))),
read.csv), envir = .GlobalEnv)
But again, it's often better to leave them in a single list.
...
How do I use cascade delete with SQL Server?
... existing foreign key constraint,
Add a new one with the ON DELETE CASCADE setting enabled.
Something like:
ALTER TABLE dbo.T2
DROP CONSTRAINT FK_T1_T2 -- or whatever it's called
ALTER TABLE dbo.T2
ADD CONSTRAINT FK_T1_T2_Cascade
FOREIGN KEY (EmployeeID) REFERENCES dbo.T1(EmployeeID) ...
Discuz轻松生成sitemaps.xml网站地图 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
PS：注意编码，选择自己DZ对应的编码，我自己用的是UTF-8版本DZ
<?php
if(!defined('IN_DISCUZ')) {
exit('Access Denied');
}
$filename='sitemaps.xml';
//以下五项根据具体情况修改即可
$cfg_updateperi='60';//协议文件更新周期的上限，单位为分...
What are the undocumented features and limitations of the Windows FINDSTR command?
...e format of matching line output is as follows:
filename:lineNumber:lineOffset:text
where
fileName: = The name of the file containing the matching line. The file name is not printed if the request was explicitly for a single file, or if searching piped input or redirected input. When printed, the fi...