大约有 15,000 项符合查询结果（耗时：0.0453秒） [XML]
What are the “standard unambiguous date” formats for string-to-date conversion in R?
...d/or abbreviations, as the conversion will depend on your locale (see the examples in ?strptime and read ?LC_TIME).
share
|
improve this answer
|
follow
|
...
How do I determine k when using k-means clustering?
...
You can maximize the Bayesian Information Criterion (BIC):
BIC(C | X) = L(X | C) - (p / 2) * log n
where L(X | C) is the log-likelihood of the dataset X according to model C, p is the number of parameters in the model C, and n is th...
Test if a property is available on a dynamic variable
...cification.
So you should actually try to access the member and catch an exception, if it fails:
dynamic myVariable = GetDataThatLooksVerySimilarButNotTheSame();
try
{
var x = myVariable.MyProperty;
// do stuff with x
}
catch (RuntimeBinderException)
{
// MyProperty doesn't exist
}
...
How to Query an NTP Server using C#?
...got deleted (It was a link to a Google code search results that no longer exist), I figured I could answer this question for future reference :
public static DateTime GetNetworkTime()
{
//default Windows time server
const string ntpServer = "time.windows.com";
// NTP message size - 16 ...
Delete rows from a pandas DataFrame based on a conditional expression involving len(string) giving K
...
I came up with a way using a list comprehension: df[[(len(x) < 2) for x in df['column name']]] but yours is much nicer. Thanks for your help!
– sjs
Dec 13 '12 at 4:17
...
How to use string.replace() in python 3.x
The string.replace() is deprecated on python 3.x. What is the new way of doing this?
8 Answers
...
OS X: equivalent of Linux's wget
How can I do an HTTP GET from a Un*x shell script on a stock OS X system? (installing third-party software is not an option, for this has to run on a lot of different systems which I don't have control on).
...
Python super() raises TypeError
... reason is that super() only operates on new-style classes, which in the 2.x series means extending from object:
>>> class X(object):
def a(self):
print 'a'
>>> class Y(X):
def a(self):
super(Y, self).a()
print 'b'
>>>...
Split a string by spaces — preserving quoted substrings — in Python
...
You want split, from the built-in shlex module.
>>> import shlex
>>> shlex.split('this is "a test"')
['this', 'is', 'a test']
This should do exactly what you want.
sh...
Assign variable in if condition statement, good practice or not? [closed]
...e you try to compare values, but use a single = instead of == or ===. For example, when you see this:
if (value = someFunction()) {
...
}
you don't know if that's what they meant to do, or if they intended to write this:
if (value == someFunction()) {
...
}
If you really want to do the...