大约有 34,900 项符合查询结果（耗时：0.0243秒） [XML]
Create numpy matrix filled with NaNs
...alternatives a[:] = numpy.nan here and a.fill(numpy.nan) as posted by Blaenk:
$ python -mtimeit "import numpy as np; a = np.empty((100,100));" "a.fill(np.nan)"
10000 loops, best of 3: 54.3 usec per loop
$ python -mtimeit "import numpy as np; a = np.empty((100,100));" "a[:] = np.nan"
10000 loops, b...
Find string between two substrings [duplicate]
...
andilabs
16.9k1111 gold badges9393 silver badges123123 bronze badges
answered Jul 30 '10 at 5:59
Nikolaus Gradwohl...
Get size of folder or file
...s no built-in way to get the size of a folder, you are going to have to walk the directory tree recursively (using the listFiles() method of a file object that represents a directory) and accumulate the directory size for yourself:
public static long folderSize(File directory) {
long length = 0...
Retrieving a random item from ArrayList [duplicate]
...won't compile anyway since it is unreachable.
Might want to re-write it like:
import java.util.ArrayList;
import java.util.Random;
public class Catalogue
{
private Random randomGenerator;
private ArrayList<Item> catalogue;
public Catalogue()
{
catalogue = new Array...
How to format strings using printf() to get equal length in the output?
I have two functions, one which produces messages like Starting initialization... and another which checks return codes and outputs "Ok" , "Warning" or "Error" . However, the output that is produced is of the different length:
...
Delete directories recursively in Java
...
You should check out Apache's commons-io. It has a FileUtils class that will do what you want.
FileUtils.deleteDirectory(new File("directory"));
share
|...
Are table names in MySQL case sensitive?
...and table names.
One can configure how tables names are stored on the disk using the system variable lower_case_table_names (in the my.cnf configuration file under [mysqld]).
Read the section: 10.2.2 Identifier Case Sensitivity for more information.
...
How to initialize an array in Java?
I am initializing an array like this:
10 Answers
10
...
How do I get the current username in .NET using C#?
...
juanjuan
71.4k4848 gold badges151151 silver badges187187 bronze badges
...
C# 3.0 auto-properties — useful or not? [closed]
Note: This was posted when I was starting out C#. With 2014 knowledge, I can truly say that auto-properties are among the best things that ever happened to the C# language.
...