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How exactly does the callstack work?

I'm trying to get a deeper understanding of how the low level operations of programming languages work and especially how they interact with the OS/CPU. I've probably read every answer in every stack/heap related thread here on Stack Overflow, and they are all brilliant. But there is still one thin...
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How to add an extra column to a NumPy array

... I think a more straightforward solution and faster to boot is to do the following: import numpy as np N = 10 a = np.random.rand(N,N) b = np.zeros((N,N+1)) b[:,:-1] = a And timings: In [23]: N = 10 In [24]: a = np.random.rand(N,N) In [25]: %timeit b = np.hstac...
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Efficient way to apply multiple filters to pandas DataFrame or Series

I have a scenario where a user wants to apply several filters to a Pandas DataFrame or Series object. Essentially, I want to efficiently chain a bunch of filtering (comparison operations) together that are specified at run-time by the user. ...
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What is the difference between “int” and “uint” / “long” and “ulong”?

I know about int and long (32-bit and 64-bit numbers), but what are uint and ulong ? 5 Answers ...
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Why is rbindlist “better” than rbind?

I am going through documentation of data.table and also noticed from some of the conversations over here on SO that rbindlist is supposed to be better than rbind . ...
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Removing duplicates from a list of lists

...pby(k)) [[1, 2], [3], [4], [5, 6, 2]] itertools often offers the fastest and most powerful solutions to this kind of problems, and is well worth getting intimately familiar with!-) Edit: as I mention in a comment, normal optimization efforts are focused on large inputs (the big-O approach) becaus...
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javascript: recursive anonymous function?

...ive the function a name, even when you're creating the function as a value and not a "function declaration" statement. In other words: (function foo() { foo(); })(); is a stack-blowing recursive function. Now, that said, you probably don't may not want to do this in general because there are som...
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Can I automatically increment the file build version when using Visual Studio?

I was just wondering how I could automatically increment the build (and version?) of my files using Visual Studio (2005). ...
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Difference in Months between two dates in JavaScript

..." is subject to a lot of interpretation. :-) You can get the year, month, and day of month from a JavaScript date object. Depending on what information you're looking for, you can use those to figure out how many months are between two points in time. For instance, off-the-cuff: function monthDif...
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How can I sharpen an image in OpenCV?

... Wikipedia article on unsharp masking: You use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant). To get a sharpened version of frame into image: (both cv::Mat) cv::GaussianBlur(frame, image, cv:...