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Efficient Algorithm for Bit Reversal (from MSB->LSB to LSB->MSB) in C
...(x & 0x0f0f0f0f) << 4));
x = (((x & 0xff00ff00) >> 8) | ((x & 0x00ff00ff) << 8));
return((x >> 16) | (x << 16));
}
From the famous Bit Twiddling Hacks page:
Fastest (lookup table):
static const unsigned char BitReverseTable256[] =
{
0x00, 0x8...
MySQL select where column is not empty
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282
Compare value of phone2 with empty string:
select phone, phone2
from jewishyellow.users
wher...
Mockito: List Matchers with generics
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282
For Java 8 and above, it's easy:
when(mock.process(Matchers.anyList()));
For Java 7 and belo...
How to Iterate over a Set/HashSet without an Iterator?
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8 Answers
8
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Write to UTF-8 file in Python
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I believe the problem is that codecs.BOM_UTF8 is a byte string, not a Unicode string. I suspect the file handler is trying to guess what you really mean based on "I'm meant to be writing Unicode as UTF-8-encoded text, but you've given me a byte string!"
Try writing th...
Is [UIScreen mainScreen].bounds.size becoming orientation-dependent in iOS8?
I ran the following code in both iOS 7 and iOS 8:
18 Answers
18
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How to select rows from a DataFrame based on column values?
...ne two three two two one three'.split(),
'C': np.arange(8), 'D': np.arange(8) * 2})
print(df)
# A B C D
# 0 foo one 0 0
# 1 bar one 1 2
# 2 foo two 2 4
# 3 bar three 3 6
# 4 foo two 4 8
# 5 bar two 5 10
# 6 foo one 6 12
# 7...
How do I determine if my python shell is executing in 32bit or 64bit?
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18 Answers
18
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Python and pip, list all versions of a package that's available?
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4,90633 gold badges2626 silver badges2828 bronze badges
4
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What does the keyword Set actually do in VBA?
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TylerH
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answered Dec 8 '08 at 14:00
TrebTreb
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