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Converting RGB to grayscale/intensity
...ferenced in an answer to a previous similar question. It is very helpful:
http://cadik.posvete.cz/color_to_gray_evaluation/
It shows 'tons' of different methods to generate grayscale images with different outcomes!
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What does the NS prefix mean?
... Internet Archive of Reference: web.archive.org/web/20151008121657/http://www.cocoabuilder.com/…
– Simon Woodside
Mar 21 at 4:09
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Why are dates calculated from January 1st, 1970?
...he date was chosen. It just was.
Astronomers use their own epochal date: http://en.wikipedia.org/wiki/Epoch_(astronomy)
Why? A date has to be chosen to make the math work out. Any random date will work.
A date far in the past avoids negative numbers for the general case.
Some of the smarter p...
匿名过程入门：倒计时与回调 - App Inventor 2 案例教程 · App Inventor 2 中文网
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What does the brk() system call do?
...ld crash immediately.
I'm not sure where the number 512GB in this diagram comes from. It implies a 64-bit virtual address space, which is inconsistent with the very simple memory map you have there. A real 64-bit address space looks more like this:
Legend: t: text, d: data, b: B...
How to sort two lists (which reference each other) in the exact same way
... of 10000 random ints): %timeit index = range(len(l1)); index.sort(key=l1.__getitem__); map(l1.__getitem__, index); map(l2.__getitem__, index) 100 loops, best of 3: 8.04 ms per loop (vs 9.17 ms, 9.07 ms for senderle's timits)
– Quantum7
Aug 12 '13 at 21:35
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乐高 EV3 实验04 - 颜色传感器巡线 · App Inventor 2 中文网
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iPhone: How to get current milliseconds?
...ose brackets' are a newer version of the syntax according to stackoverflow.com/q/11474284/209828
– Matthew
Nov 7 '13 at 17:38
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What happened to “HelveticaNeue-Italic” on iOS 7.0.3
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How to printf uint64_t? Fails with: “spurious trailing ‘%’ in format”
I wrote a very simple test code of printf uint64_t:
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