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Recommended SQL database design for tags or tagging [closed]
...dding a fixed number of possible TagID columns to ItemID (seems like a bad idea), Keeping tags in a text column that's comma separated (sounds crazy but could work). I've even heard someone recommend a sparse matrix, but then how do the tag names grow gracefully?
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Test if characters are in a string
...ywhere on the input line, I'll explain "Regular Expression" below, but the idea is it's a smarter way to match the string (R calls this "character", eg class("abc")), and "Print" because it's a command line program, emitting output means it prints to its output string.
Now, the grep program is basi...
Do you use NULL or 0 (zero) for pointers in C++?
... +1. Agreed with Andy. @Ferruccio, Implementation detail of programmer's idea is not the same as compiler's implementation defined
– user
Feb 15 '14 at 23:08
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What is the Comonad typeclass in Haskell?
...though it would indeed be great to know how they were intended. As in: The idea behind them.
– Evi1M4chine
Mar 4 '16 at 21:10
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Simple and fast method to compare images for similarity
...a few methods on top of my head that could possibly help you:
Simple euclidean distance as mentioned by @carlosdc (doesn't work with transformed images and you need a threshold).
(Normalized) Cross Correlation - a simple metrics which you can use for comparison of image areas. It's more robust tha...
How to clone all repos at once from GitHub?
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Any idea how this is done for private repos that you have access to?
– MichaelGofron
Aug 4 '16 at 5:59
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How to add dividers and spaces between items in RecyclerView?
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I wonder if it is a good idea to use Paint instead of creating a drawable? Then I can call canvas.drawLine(startX, startY, stopX, stopY, mPaint) in onDrawOver? Any performance difference?
– Arst
Sep 2 '15 at 23:...
How can I detect if a browser is blocking a popup?
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Update:
Popups exist from really ancient times. The initial idea was to show another content without closing the main window. As of now, there are other ways to do that: JavaScript is able to send requests for server, so popups are rarely used. But sometimes they are still handy.
In ...
How do I iterate through each element in an n-dimensional matrix in MATLAB?
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The idea of a linear index for arrays in matlab is an important one. An array in MATLAB is really just a vector of elements, strung out in memory. MATLAB allows you to use either a row and column index, or a single linear index. ...
Using boolean values in C
... using values other than one as equivalent for true is almost always a bad idea. So in your example, assuming that a and b count up from zero, I'd recommend a > 0 == b > 0 instead. If you insist on taking advantage of the truthiness of arbitrary non-zero values, !!var yields the boolean 0/1 v...