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Determine if a function exists in bash
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answered Sep 17 '08 at 18:00
JBBJBB
3,85733 gold badges2222 silver badges2525 bronze badges
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Imitating a blink tag with CSS3 animations
...
The original Netscape <blink> had an 80% duty cycle. This comes pretty close, although the real <blink> only affects text:
.blink {
animation: blink-animation 1s steps(5, start) infinite;
-webkit-animation: blink-animation 1s steps(5, start) infi...
Difference between Dictionary and Hashtable [duplicate]
...ing (and compile-time verification)
use without boxing
If you are .NET 2.0 or above, you should prefer Dictionary<TKey,TValue> (and the other generic collections)
A subtle but important difference is that Hashtable supports multiple reader threads with a single writer thread, while Dictiona...
Check if a JavaScript string is a URL
...ted Feb 25 '19 at 15:23
3limin4t0r
10.3k11 gold badge1111 silver badges3131 bronze badges
answered Apr 19 '11 at 13:29
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Remove columns from dataframe where ALL values are NA
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160
Try this:
df <- df[,colSums(is.na(df))<nrow(df)]
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Error - trustAnchors parameter must be non-empty
...ll -Djavax.net.ssl.trustStore=/Another/path/to/cacerts -jar test_get_https-0.0.1-SNAPSHOT-jar-with-dependencies.jar https://www.calca.com.py 2>&1| grep -i truststore
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Importing a Maven project into Eclipse from Git
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103
+50
Eclipse ...
What is the difference between PS1 and PROMPT_COMMAND
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answered Jun 17 '10 at 1:38
Scott ThomsonScott Thomson
73966 silver badges44 bronze badges
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Timeout on a function call
...al function handler
In [4]: signal.signal(signal.SIGALRM, handler)
Out[4]: 0
# Define a timeout for your function
In [5]: signal.alarm(10)
Out[5]: 0
In [6]: try:
...: loop_forever()
...: except Exception, exc:
...: print(exc)
....:
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Forever is o...
How to draw a circle with text in the middle?
...enter the text vertically. In this example the height and line-height are 500px.
Example
JSFiddle
.circle {
width: 500px;
height: 500px;
line-height: 500px;
border-radius: 50%;
font-size: 50px;
color: #fff;
text-align: center;
background: #000
}
<div class="circle">Hello I...