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Java Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable
... well sometime - it won't work on linux then its good to install Xvfb with apt and run it on any screen like: Xvfb :1 and then set variable in build phase -- export DISPLAY=:1 --> this perfectly works.
– Pankaj Kumar Katiyar
Sep 22 '18 at 3:39
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Any reason not to start using the HTML 5 doctype? [closed]
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Well consider this:
When serving as text/html, all you need a doctype for is to trigger standards mode. Beyond that, the doctype does nothing as far as browsers are concerned.
When serving as text/html, whether you use XHTML markup or HTML markup, it's treated by browser...
What is the best method of handling currency/money?
... price calculation.
If you insist on using integers, you will have to manually convert to and from BigDecimals everywhere, which will probably just become a pain.
As pointed out by mcl, to print the price, use:
number_to_currency(price, :unit => "€")
#=> €1,234.01
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Nearest neighbors in high-dimensional data?
...ted in Approximate Nearest Neighbor (ANN) algorithms. The idea is that you allow the algorithm to return sufficiently near neighbors (perhaps not the nearest neighbor); in doing so, you reduce complexity. You mentioned the kd-tree; that is one example. But as you said, kd-tree works poorly in high d...
Read lines from a file into a Bash array [duplicate]
... from BinaryZebra's comment
and tested here. The addition of command eval allows for the expression to be kept in the present execution environment while the expressions before are only held for the duration of the eval.
Use $IFS that has no spaces\tabs, just newlines/CR
$ IFS=$'\r\n' GLOBIGNORE=...
Given two directory trees, how can I find out which files differ by content?
If I want find the differences between two directory trees, I usually just execute:
10 Answers
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Regex empty string or email
...hing an email address (that is, if you want wrong code that happens to (usually) work), use the regular-expressions.info link someone else submitted.
As for the empty string, ^$ is mentioned by multiple people and will work fine.
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py2exe - generate single executable file
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PyInstaller will create a single .exe file with no dependencies; use the --onefile option. It does this by packing all the needed shared libs into the executable, and unpacking them before it runs, just as you describe (EDIT: py2ex...
Algorithm to find top 10 search terms
... looks like an awful lot of data, with a perhaps prohibitive cost to store all frequencies. When the amount of data is so large that we cannot hope to store it all, we enter the domain of data stream algorithms.
Useful book in this area:
Muthukrishnan - "Data Streams: Algorithms and Applications"
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Virtual member call in a constructor
I'm getting a warning from ReSharper about a call to a virtual member from my objects constructor.
18 Answers
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