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How do I find Waldo with Mathematica?
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My guess at a "bulletproof way to do this" (think CIA finding Waldo in any satellite image any time, not just a single image without competing elements, like striped shirts)... I would train a Boltzmann machine on many images...
System.currentTimeMillis() vs. new Date() vs. Calendar.getInstance().getTime()
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On my machine I tried check it. My result:
Calendar.getInstance().getTime() (*1000000 times) = 402ms
new Date().getTime(); (*1000000 times) = 18ms
System.currentTimeMillis() (*1000000 times) = 16ms
Don't forget about GC (if ...
Network tools that simulate slow network connection [closed]
...or several Internet connections types (DSL, Cable, T1, dial-up etc.) while my browser and web server are on the same LAN or even on the same machine. Are there any simple network tools or browser plug-ins that slow down network bandwidth to simulate different real-world connection scenarios.
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Total size of the contents of all the files in a directory [closed]
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works on my newer red hat boxes, unfortunately not on my embedded Dev box.
– Arthur Ulfeldt
Aug 6 '09 at 22:34
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CHECK constraint in MySQL is not working
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MySQL 8.0.16 is the first version that supports CHECK constraints.
Read https://dev.mysql.com/doc/refman/8.0/en/create-table-check-constraints.html
If you use MySQL 8.0.15 or earlier, the MySQL Reference Manual says:
T...
jQuery validation: change default error message
...ages to the markup rather than the code:
<input ... data-msg-required="my message" ...
Or, a more general solution using a single short data-msg attribute on all fields:
<form id="form1">
<input type="text" id="firstName" name="firstName"
data-msg="Please enter your firs...
Transposing a 2D-array in JavaScript
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here is my implementation in modern browser (without dependency):
transpose = m => m[0].map((x,i) => m.map(x => x[i]))
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Why do I get “Pickle - EOFError: Ran out of input” reading an empty file?
... don't need to use ; but I just came from C, and not using ; at the end of my lines make my cry T.T
– Magix
Jul 16 '14 at 23:00
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how to ignore namespaces with XPath
My goal is to extract certain nodes from multiple xml files with multiple namespaces using XPath. Everything works fine as long as i know the namespace URIs. The namespace name itself remains constant, but the Schemas (XSD) are sometimes client-generated i.e. unknown to me. Then i am left with basic...
How do I check if there are duplicates in a flat list?
...are the timings of the different solutions presented here. For this I used my own library simple_benchmark:
So indeed for this case the solution from Denis Otkidach is fastest.
Some of the approaches also exhibit a much steeper curve, these are the approaches that scale quadratic with the number...