大约有 46,000 项符合查询结果（耗时：0.0491秒） [XML]
Way to get number of digits in an int?
...
30 Answers
30
Active
...
How do you calculate the average of a set of circular data? [closed]
...
102
Compute unit vectors from the angles and take the angle of their average.
...
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....
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");...
How to set a single, main title above all the subplots with Pyplot?
...plotlib.pyplot as plt
import numpy as np
fig=plt.figure()
data=np.arange(900).reshape((30,30))
for i in range(1,5):
ax=fig.add_subplot(2,2,i)
ax.imshow(data)
fig.suptitle('Main title') # or plt.suptitle('Main title')
plt.show()
...
Ruby on Rails and Rake problems: uninitialized constant Rake::DSL
...
A tweet from DHH earlier. Rake .9.0 breaks Rails and several other things, you need to:
gem "rake", "0.8.7"
in your Gemfile.
share
|
improve this answer
...
Odd behavior when Java converts int to byte?
...mber is the positive version of that number
For example: 11111111 goes to 00000001 = -1. This is what Java will display as the value.
What you probably want to do is know the unsigned value of the byte.
You can accomplish this with a bitmask that deletes everything but the least significant 8 bit...
How can I determine whether a 2D Point is within a Polygon?
...ion, it might translate to something else. On retina screens half a point (0.5/0.5) is pixel. Still, I never noticed that macOS UIs are significantly slower than other UIs. After all 3D APIs (OpenGL or Direct3D) also works with floats and modern graphics libraries very often take advantage of GPU ac...
HTML5 canvas ctx.fillText won't do line breaks?
... Neuron
3,54333 gold badges2323 silver badges4040 bronze badges
answered Feb 18 '11 at 14:42
Simon SarrisSimon Sarris
56k121...
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for Se
I tried to restart my Apache server on CentOS 5.0 and got this message:
11 Answers
11
...