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qmake: could not find a Qt installation of ''
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sudo apt-get install qt5-default works for me.
$ aptitude show qt5-default
tells that
This package sets Qt 5 to be the default Qt version to be used when using
development binaries like qmake. It provides a default configuration for
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Better way to shuffle two numpy arrays in unison
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Your "scary" solution does not appear scary to me. Calling shuffle() for two sequences of the same length results in the same number of calls to the random number generator, and these are the only "random" elements in the shuffle algorithm. By resetting the state, you ensure ...
Best way to create an empty object in JSON with PHP?
To create an empty JSON object I do usually use:
7 Answers
7
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What is the meaning of “$” sign in JavaScript
...of $ in JavaScript. $ is simply a valid JavaScript identifier.
JavaScript allows upper and lower letters, numbers, and $ and _. The $ was intended to be used for machine-generated variables (such as $0001).
Prototype, jQuery, and most javascript libraries use the $ as the primary base object (or f...
How do I install pip on macOS or OS X?
I spent most of the day yesterday searching for a clear answer for installing pip (package manager for Python). I can't find a good solution.
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How to convert SSH keypairs generated using PuTTYgen (Windows) into key-pairs used by ssh-agent and
... ssh from the windows command line using passwordless keys for me (specifically for git access). Would have saved me hours of pain if I had seen it earlier! Thanks!
– cori
Jan 25 '13 at 12:20
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C/C++ maximum stack size of program
...presents graph nodes) So assuming worst case, depth of recursive function calls can go upto 10000 with each call taking upto say 20 bytes. So is it feasible means is there a possibility of stackoverflow?
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Practical non-image based CAPTCHA approaches?
...quite a good idea and is exactly the same as doing it in JavaScript. Good Call.
@AviD: I'm aware that this method is prone to direct attacks as I've mentioned on my blog. However, it will defend against your average spam bot which blindly submits rubbish to any form it can find.
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What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
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10
Thats an if/else statement equilavent to
if(row % 2 == 1){
System.out.print("<");
}else{
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Named colors in matplotlib
... have been moved under the 'xkcd:' prefix since I posted this answer originally.
I really didn't change much from the matplotlib example, but here is the code for completeness.
import matplotlib.pyplot as plt
from matplotlib import colors as mcolors
colors = dict(mcolors.BASE_COLORS, **mcolors...