大约有 44,667 项符合查询结果（耗时：0.0386秒） [XML]
How do I create an average from a Ruby array?
...r.inject(0.0) { |sum, el| sum + el } / arr.size
=> 6.5
You can define it as part of Array as another commenter has suggested, but you need to avoid integer division or your results will be wrong. Also, this isn't generally applicable to every possible element type (obviously, an average only ma...
Split string to equal length substrings in Java
How to split the string "Thequickbrownfoxjumps" to substrings of equal size in Java.
Eg. "Thequickbrownfoxjumps" of 4 equal size should give the output.
...
Is there a way to measure how sorted a list is?
...nversion of A.
The inversion number of a sequence is one common measure of its sortedness.Formally, the inversion number is defined to be the number of inversions, that is,
To make these definitions clearer, consider the example sequence 9, 5, 7, 6. This sequence has the inversions (0,1), (0,2), (...
How do I force Postgres to use a particular index?
How do I force Postgres to use an index when it would otherwise insist on doing a sequential scan?
6 Answers
...
How to send an email with Python?
...this example, assume that
# the text file contains only ASCII characters.
with open(textfile, 'rb') as fp:
# Create a text/plain message
msg = MIMEText(fp.read())
# me == the sender's email address
# you == the recipient's email address
msg['Subject'] = 'The contents of %s' % textfile
msg['...
Is it possible to set async:false to $.getJSON call
Is it possible to set async: false when calling $.getJSON() so that the call blocks rather than being asynchronous?
7 A...
Type or namespace name does not exist [closed]
I have a WCF Data Service project built with Visual Studio 2010, which was working fine. All of a sudden, it didn't compile anymore. It was giving me messages like:
...
Decimal number regular expression, where digit after decimal is optional
...eed a regular expression that validates a number, but doesn't require a digit after the decimal.
ie.
15 Answers
...
How to change the button text of ?
I tried to modify the value , but it's not working. How to customize the button text?
21 Answers
...
Defining a variable with or without export
...ss. You would use this for (say) loop variables, temporary variables etc.
It's important to note that exporting a variable doesn't make it available to parent processes. That is, specifying and exporting a variable in a spawned process doesn't make it available in the process that launched it.
...