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map vs. hash_map in C++
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An unordered_map should give slightly better performance for accessing known elements of the collection, but a map will have additional useful characteristics (e.g. it is stored in sorted order, which allows traversal from start to finish). unordered_map will be faster on insert and delete than ...
How to write a multidimensional array to a text file?
...8.00 199.00
# New slice
Reading it back in is very easy, as long as we know the shape of the original array. We can just do numpy.loadtxt('test.txt').reshape((4,5,10)). As an example (You can do this in one line, I'm just being verbose to clarify things):
# Read the array from disk
new_data = np...
Python 3 turn range to a list
... to "convert". You're right about it not being a cast... I don't really know what to call it exactly.
– mgilson
Jul 14 '12 at 1:21
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presentViewController:animated:YES view will not appear until user taps again
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Right now, setUpViewForNextQuestion just calls reloadData on the tableview (to change all the background colours back to white if any had been set to red by an incorrect guess). But would any changes there make any difference? The ...
Lombok is not generating getter and setter
...uld have come to this thread when they were facing the same thing and not knowing if the plugin is needed for the IntelliJ. thumbs up
– Vaibs
Feb 23 '19 at 13:45
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Formatting code snippets for blogging on Blogger [closed]
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I used to use hilite.me, but now I prefer dillinger.io
– GoYun.Info
Mar 19 '15 at 1:48
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Insert, on duplicate update in PostgreSQL?
...rying to prevent a natural and healthy DB behavior. I understand it better now.
– W.M.
Aug 8 '16 at 15:58
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show 3 more comments
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How to find where gem files are installed
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After installing the gems, if you want to know where a particular gem is. Try typing:
gem list
You will be able to see the list of gems you have installed. Now use bundle show and name the gem you want to know the path for, like this:
bundle show <gemName&g...
How to remove convexity defects in a Sudoku square?
...a mask for the sudoku grid:
mask = FillingTransform[largestComponent]
Now, I can use a 2nd order derivative filter to find the vertical and horizontal lines in two separate images:
lY = ImageMultiply[MorphologicalBinarize[GaussianFilter[srcAdjusted, 3, {2, 0}], {0.02, 0.05}], mask];
lX = Image...
Calculate distance between two points in google maps V3
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The link above is now broken, but the explanation of the method makes that not much of an issue.
– GChorn
Apr 4 '14 at 22:40
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