大约有 45,000 项符合查询结果（耗时：0.0395秒） [XML]
Error: free(): invalid next size (fast):
...rror I'm getting? I'm compiling C++ using g++ on Ubuntu 10.10. It pops up randomly when I run the executable (maybe 2 times in 8 hours, with 10 compiles an hour). However, if I make clean and recompile it goes away most of the time.
...
How to equalize the scales of x-axis and y-axis in Python matplotlib?
... indeed works like charm. Could you please tell me what plt.plot(range(5)) and plt.gca().set_aspect('equal', adjustable='box') do, if you don't mind? Also, I notice that even if I don't have plt.draw(), the plot will still show up. Then what is the use of it?
– Sibbs Gambling
...
LINQ: Distinct values
...g to be distinct by more than one field? If so, just use an anonymous type and the Distinct operator and it should be okay:
var query = doc.Elements("whatever")
.Select(element => new {
id = (int) element.Attribute("id"),
c...
Multiprocessing vs Threading Python [duplicate]
I am trying to understand the advantages of multiprocessing over threading . I know that multiprocessing gets around the Global Interpreter Lock, but what other advantages are there, and can threading not do the same thing?
...
Can you make just part of a regex case-insensitive?
...e minus sign will be turned off. E.g. (?i-sm) turns on case insensitivity, and turns off both single-line mode and multi-line mode.
Not all regex flavors support this. JavaScript and Python apply all mode modifiers to the entire regular expression. They don't support the (?-ismx) syntax, since turn...
What is the difference between float and double?
I've read about the difference between double precision and single precision. However, in most cases, float and double seem to be interchangeable, i.e. using one or the other does not seem to affect the results. Is this really the case? When are floats and doubles interchangeable? What are the d...
Should CSS always preceed Javascript?
...ownload each time a page is loaded.
To simulate reality, I included jQuery and the H5BP CSS (so there's a decent amount of script/CSS to parse)
Set up two pages - one with CSS before script, one with CSS after script.
Recorded how long it took for the external script in the <head> to execute
R...
Java regex capturing groups indexes
...
Capturing and grouping
Capturing group (pattern) creates a group that has capturing property.
A related one that you might often see (and use) is (?:pattern), which creates a group without capturing property, hence named non-capturi...
How do you reverse a string in place in JavaScript?
...
As long as you're dealing with simple ASCII characters, and you're happy to use built-in functions, this will work:
function reverse(s){
return s.split("").reverse().join("");
}
If you need a solution that supports UTF-16 or other multi-byte characters, be aware that this f...
Convert dmesg timestamp to custom date format
I am trying to understand the dmesg timestamp and find it hard to convert that to change it to java date/custom date format.
...