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Check if a program exists from a Makefile
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Sometimes you need a Makefile to be able to run on different target OS's and you want the build to fail early if a required executable is not in PATH rather than to run for a possibly long time before failing.
The excellent solution provided by engineerchuan requires making a target. However, if ...
Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
I'm having a little trouble understanding the pass-by-reference properties of data.table . Some operations seem to 'break' the reference, and I'd like to understand exactly what's happening.
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Relatively position an element without it taking up space in document flow
How can I relatively position an element, and have it not take up space in the document flow?
6 Answers
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Static methods - How to call a method from another method?
... here: It is clear that classmethods have no drawbacks over staticmethods, and classmethods allows the method to be extended in the future to call other class methods. Thus it should always be preferred, even though there is no immediate need.
– u0b34a0f6ae
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Shortest way to print current year in a website
...vaScript has "automatic semicolon insertion," a feature I normally despise and rail against, but in this specific use case it should be safe enough.
It's important to note that this only works on browsers where JavaScript is enabled. Ideally, this would be better handled as an offline batch job (s...
POST JSON fails with 415 Unsupported media type, Spring 3 mvc
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I've had this happen before with Spring @ResponseBody and it was because there was no accept header sent with the request. Accept header can be a pain to set with jQuery, but this worked for me source
$.postJSON = function(url, data, callback) {
return jQuery.ajax({
hea...
Changing the “tick frequency” on x or y axis in matplotlib?
...np.arange was used rather than Python's range function just in case min(x) and max(x) are floats instead of ints.)
The plt.plot (or ax.plot) function will automatically set default x and y limits. If you wish to keep those limits, and just change the stepsize of the tick marks, then you could us...
How to view DLL functions?
...obably best to use Dependency Walker. It also possible to use dumpbin command line utility that comes with Visual Studio.
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Moving UITabBarItem Image down?
Normally on each tab of a UITabBar you have a small image and a title naming the tab. The image is positioned/centred towards the top of the tab to accommodate the title underneath. My question is: if you want to have a tabBar with just an image and no title is there a way to move the image down ...
Is it secure to store passwords as environment variables (rather than as plain text) in config files
I work on a few apps in rails, django (and a little bit of php), and one of the things that I started doing in some of them is storing database and other passwords as environment variables rather than plain text in certain config files (or in settings.py, for django apps).
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