大约有 46,000 项符合查询结果（耗时：0.0387秒） [XML]
Finding local maxima/minima with Numpy in a 1D numpy array
...
bobrobbob
1,2001010 silver badges2121 bronze badges
answered Jan 7 '11 at 11:41
Sven MarnachSven Marnach
...
How to write a cron that will run a script every day at midnight?
...how to use it on Ubuntu. Your crontab line will look something like this:
00 00 * * * ruby path/to/your/script.rb
(00 00 indicates midnight--0 minutes and 0 hours--and the *s mean every day of every month.)
Syntax:
mm hh dd mt wd command
mm minute 0-59
hh hour 0-23
dd day of month 1-...
What is “entropy and information gain”?
...
1051
I assume entropy was mentioned in the context of building decision trees.
To illustrate, imag...
Programmatically create a UIView with color gradient
...
702
Objective-C:
UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 50)];
CAGradie...
How to determine if a list of polygon points are in clockwise order?
...se. (The result is twice the enclosed area, with a +/- convention.)
point[0] = (5,0) edge[0]: (6-5)(4+0) = 4
point[1] = (6,4) edge[1]: (4-6)(5+4) = -18
point[2] = (4,5) edge[2]: (1-4)(5+5) = -30
point[3] = (1,5) edge[3]: (1-1)(0+5) = 0
point[4] = (1,0) edge[4]: (5-1)(0+0) = 0
...
Creating a comma separated list from IList or IEnumerable
...ng"};
string joined = string.Join(",", strings);
Detail & Pre .Net 4.0 Solutions
IEnumerable<string> can be converted into a string array very easily with LINQ (.NET 3.5):
IEnumerable<string> strings = ...;
string[] array = strings.ToArray();
It's easy enough to write the equiv...
Get a filtered list of files in a directory
...
400
import glob
jpgFilenamesList = glob.glob('145592*.jpg')
See glob in python documenttion
...
Which is faster in Python: x**.5 or math.sqrt(x)?
...
math.sqrt(x) is significantly faster than x**0.5.
import math
N = 1000000
%%timeit
for i in range(N):
z=i**.5
10 loops, best of 3: 156 ms per loop
%%timeit
for i in range(N):
z=math.sqrt(i)
10 loops, best of 3: 91.1 ms per loop
Using Python 3.6....
What is the difference between shallow copy, deepcopy and normal assignment operation?
...rint id(c) == id(d) # True - d is the same object as c
print id(c[0]) == id(d[0]) # True - d[0] is the same object as c[0]
Using a shallow copy:
d = copy.copy(c)
print id(c) == id(d) # False - d is now a new object
print id(c[0]) == id(d[0]) # True - d[0] is the same obje...
How do I combine a background-image and CSS3 gradient on the same element?
...
1580
Multiple backgrounds!
body {
background: #eb01a5;
background-image: url("IMAGE_URL");...