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Regex to validate date format dd/mm/yyyy
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I generated it online using some website and now i also don't remember the website from which I generated this image. I will add the reference once I remember:)
– Alok Chaudhary
Apr 10 '15 at 3:58
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Symfony 2 EntityManager injection in service
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Update to my own solution. The proper way now should be to use Entities and Repositories. Entity Manager is already naturally injected into a repository. You can see an example here: youtu.be/AHVtOJDTx0M
– Robert Saylor
Oct 1 '1...
String concatenation vs. string substitution in Python
... large boosts in performance..."
If performance matters, this is good to know.
However, performance problems I've seen have never come down to string operations. I've generally gotten in trouble with I/O, sorting and O(n2) operations being the bottlenecks.
Until string operations are the perfor...
Determine which JAR file a class is from
I am not in front of an IDE right now, just looking at the API specs.
4 Answers
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How to split a column into two columns?
...ing the power of the str.extract() method.
But for a simple split over a known separator (like, splitting by dashes, or splitting by whitespace), the .str.split() method is enough1. It operates on a column (Series) of strings, and returns a column (Series) of lists:
>>> import pandas as p...
Showing data values on stacked bar chart in ggplot2
...ack(vjust = 0.5))
Also note that "position_stack() and position_fill() now stack values in the reverse order of the grouping, which makes the default stack order match the legend."
Answer valid for older versions of ggplot:
Here is one approach, which calculates the midpoints of the bars.
l...
Command-line Tool to find Java Heap Size and Memory Used (Linux)?
...on you should do it within code or you can use jconsole. This is what I know there should also be many other ways.
– padippist
Jan 18 '17 at 6:47
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What is the difference between BIT and TINYINT in MySQL?
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Sorry thought we were on T_SQL here so therefore I dont know
– Allen Hardy
Nov 14 '08 at 14:39
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Highlight a word with jQuery
... a good idea to copy the code here; the link points to the latest version (now :)).
– Lerin Sonberg
Jan 24 '15 at 9:56
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