大约有 16,000 项符合查询结果（耗时：0.0365秒） [XML]
Call apply-like function on each row of dataframe with multiple arguments from each row
... Don't use apply on big data.frames it will copy the entire object (to convert to a matrix). This will also cause problems If you have different class objects within the data.frame.
– mnel
Feb 25 '13 at 2:47
...
What was the strangest coding standard rule that you were forced to follow? [closed]
...
What is the supposed point of this rule? Personally I'd fail a code review for code that could be made easier to read by putting in another return.
– Mark Baker
Oct 20 '08 at 15:31
...
Does Swift have access modifiers?
...arget). You typically use open or public access when specifying the public interface to a framework.
However, open access applies only to classes and class members, and it differs from public access as follows:
public classes and class members can only be subclassed and overridden within the defi...
Running multiple AsyncTasks at the same time — not possible?
...PDATE:
Here is what current (2012-01-27) API says on this:
When first introduced, AsyncTasks were executed serially on a single background thread. Starting with DONUT, this was changed to a pool of threads allowing multiple tasks to operate in parallel. After HONEYCOMB, it is planned to change ...
Declaring and initializing variables within Java switches
...in other cases - it leads to highly confusing code, as you've seen. When I introduce local variables in switch statements (which I try to do rarely - cases should be very short, ideally) I usually prefer to introduce a new scope:
case 1: {
int value = 1;
...
break;
}
case 2: {
int v...
Android and setting alpha for (image) view alpha
Is there really no XML attribute counterpart to setAlpha(int) ?
9 Answers
9
...
Why are preprocessor macros evil and what are the alternatives?
... != 0) res = x/y;
and then
if (something) safe_divide(b, a, x);
else printf("Something is not set...");
It actually becomes completely the wrong thing....
Replacement: real functions.
3) Macros have no namespace
If we have a macro:
#define begin() x = 0
and we have some code in C++ tha...
How to reverse a singly linked list using only two pointers?
...f there exists some logic to reverse a singly-linked list using only two pointers.
33 Answers
...
Any gotchas using unicode_literals in Python 2.6?
... both, python tries to decode the encoded string (assuming it's ascii) and convert it to unicode and fails. It would work if you did print name + two.name.decode('utf-8').
The same thing can happen if you encode a string and try to mix them later.
For example, this works:
# encoding: utf-8
html = ...
URLWithString: returns nil
...breaks if the URL has a # in it. stringByAddingPercentEscapesUsingEncoding converts # to %2
– Ali Saeed
Mar 2 '16 at 21:21
3
...