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What is the fastest way to compute sin and cos together?
...ly one after another like a = cos(x); b = sin(x); , but I wonder if there is a faster way when needing both values.
19 Ans...
Image Processing: Algorithm Improvement for 'Coca-Cola Can' Recognition
...RF).
You can find a nice OpenCV code example in Java, C++, and Python on this page: Features2D + Homography to find a known object
Both algorithms are invariant to scaling and rotation. Since they work with features, you can also handle occlusion (as long as enough keypoints are visible).
Image sou...
How to prevent a dialog from closing when a button is clicked
...t will validate the input and then close the dialog. However, if the input is wrong, I want to remain in the same dialog. Every time no matter what the input is, the dialog should be automatically closed when I click on the "no" button. How can I disable this? By the way, I have used PositiveButton ...
Which is better option to use for dividing an integer number by 2?
Which of the following techniques is the best option for dividing an integer by 2 and why?
23 Answers
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Best Practices: Salting & peppering passwords?
I came across a discussion in which I learned that what I'd been doing wasn't in fact salting passwords but peppering them, and I've since begun doing both with a function like:
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What does the `forall` keyword in Haskell/GHC do?
I'm beginning to understand how the forall keyword is used in so-called "existential types" like this:
8 Answers
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How do you test to see if a double is equal to NaN?
I have a double in Java and I want to check if it is NaN .
What is the best way to do this?
7 Answers
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What is the purpose of mock objects?
...s", I'll try a layman's example.
Unit Testing
Imagine unit testing for this system:
cook <- waiter <- customer
It's generally easy to envision testing a low-level component like the cook:
cook <- test driver
The test driver simply orders different dishes and verifies the cook return...
Check if directory mounted with bash
...en
echo "yay"
else
echo "nay"
fi
In my example, the if-statement is checking the exit code of grep, which indicates if there was a match. Since I don't want the output to be displayed when there is a match, I'm redirecting it to /dev/null.
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uint8_t can't be printed with cout
...y print a blank, but most probably the ASCII character with value 5, which is non-printable (or invisible). There's a number of invisible ASCII character codes, most of them below value 32, which is the blank actually.
You have to convert aa to unsigned int to output the numeric value, since ostrea...