大约有 47,000 项符合查询结果（耗时：0.0681秒） [XML]
How to detect if a script is being sourced
...
This seems to be portable between Bash and Korn:
[[ $_ != $0 ]] && echo "Script is being sourced" || echo "Script is a subshell"
A line similar to this or an assignment like pathname="$_" (with a later test and action) must be on the first line of the script or on the line ...
How do I plot in real-time in a while loop using matplotlib?
... version of the code in question (requires at least version Matplotlib 1.1.0 from 2011-11-14):
import numpy as np
import matplotlib.pyplot as plt
plt.axis([0, 10, 0, 1])
for i in range(10):
y = np.random.random()
plt.scatter(i, y)
plt.pause(0.05)
plt.show()
Note some of the changes...
How to detect a Christmas Tree? [closed]
...
10 Answers
10
Active
...
Simple regular expression for a decimal with a precision of 2
...
408
Valid regex tokens vary by implementation. A generic form is:
[0-9]+(\.[0-9][0-9]?)?
More co...
Applying a function to every row of a table using dplyr?
...
202
As of dplyr 0.2 (I think) rowwise() is implemented, so the answer to this problem becomes:
iri...
How to slice an array in Bash
...
answered Aug 26 '09 at 17:10
Paused until further notice.Paused until further notice.
286k8181 gold badges340340 silver badges409409 bronze badges
...
Add a common Legend for combined ggplots
...
108
Update 2015-Feb
See Steven's answer below
df1 <- read.table(text="group x y
gro...
What's the best practice to round a float to 2 decimals? [duplicate]
...
160
I was working with statistics in Java 2 years ago and I still got the codes of a function that a...
Can I set background image and opacity in the same property?
...
Two methods:
Convert to PNG and make the original image 0.2 opacity
(Better method) have a <div> that is position: absolute; before #main and the same height as #main, then apply the background-image and opacity: 0.2; filter: alpha(opacity=20);.
...
Shortest distance between a point and a line segment
...at l2 = length_squared(v, w); // i.e. |w-v|^2 - avoid a sqrt
if (l2 == 0.0) return distance(p, v); // v == w case
// Consider the line extending the segment, parameterized as v + t (w - v).
// We find projection of point p onto the line.
// It falls where t = [(p-v) . (w-v)] / |w-v|^2
...