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Running a Haskell program on the Android OS
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A language that has recently come to my attention is Eta.
Eta's compiler is a fork of GHC 7.10 which has a JVM backend. It is possible to use the generated JAR files to write Android apps and even use its Foreign Function Interface to call native Android Java l...
Generating a PNG with matplotlib when DISPLAY is undefined
...ooses an x-using backend by default. I just had the same problem on one of my servers. The solution for me was to add the following code in a place that gets read before any other pylab/matplotlib/pyplot import:
import matplotlib
# Force matplotlib to not use any Xwindows backend.
matplotlib.use('...
How to Set Opacity (Alpha) for View in Android
...namically
If you need to dynamically alter the opacity in your code, use
myButton.getBackground().setAlpha(128); // 50% transparent
Where the INT ranges from 0 (fully transparent) to 255 (fully opaque).
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fatal: The current branch master has no upstream branch
I'm trying to push one of my projects to github, and I keep getting this error:
22 Answers
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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...