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MySQL - Using COUNT(*) in the WHERE clause
...
try this;
select gid
from `gd`
group by gid
having count(*) > 10
order by lastupdated desc
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Fastest way to tell if two files have the same contents in Unix/Linux?
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410
I believe cmp will stop at the first byte difference:
cmp --silent $old $new || echo "files are...
In mocha testing while calling asynchronous function how to avoid the timeout Error: timeout of 2000
...nous functions using mocha, I'm getting timeout error ( Error: timeout of 2000ms exceeded. ). How can I resolve this?
7 Ans...
FAT32系统中长文件名的存储 - C/C++ - 清泛网 - 专注C/C++及内核技术
...表示定义
字节偏移(16进制)
字节数
定义
0x0~0x7
8
文件名
0x8~0xA
3
扩展名
0xB*
1
属性字节
00000000(读写)
00000001(只读)
00000010(隐藏)
00000100(系统)
00001000(卷标)
00010000(...
Listing all permutations of a string/integer
...more elaborate (and since it is tagged c #), from http://radio.weblogs.com/0111551/stories/2002/10/14/permutations.html :
Rather lengthy, but I decided to copy it anyway, so the post is not dependent on the original.
The function takes a string of characters, and writes down every possible permutat...
For every character in string
...fashioned for-loop:
std::string str = ???;
for(std::string::size_type i = 0; i < str.size(); ++i) {
do_things_with(str[i]);
}
Looping through the characters of a null-terminated character array:
char* str = ???;
for(char* it = str; *it; ++it) {
do_things_with(*it);
}
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Peak detection in a 2D array
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+500
I detected the peaks using a local maximum filter. Here is the result on your first dataset of 4 paws:
I also ran it on the second ...
count the frequency that a value occurs in a dataframe column
...['freq'] = df.groupby('a')['a'].transform('count')
df
Out[41]:
a freq
0 a 2
1 b 3
2 s 2
3 s 2
4 b 3
5 a 2
6 b 3
[7 rows x 2 columns]
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How does the bitwise complement operator (~ tilde) work?
...ple, here's the representation of -2 in two's complement: (8 bits)
1111 1110
The way you get this is by taking the binary representation of a number, taking its complement (inverting all the bits) and adding one. Two starts as 0000 0010, and by inverting the bits we get 1111 1101. Adding one gets u...
Show Youtube video source into HTML5 video tag?
...irplay="allow"
data-youtube-id="N9oxmRT2YWw"
src="http://v20.lscache8.c.youtube.com/videoplayback?sparams=id%2Cexpire%2Cip%2Cipbits%2Citag%2Cratebypass%2Coc%3AU0hPRVRMVV9FSkNOOV9MRllD&amp;itag=43&amp;ipbits=0&amp;signature=D2BCBE2F115E68C5FF97673F1D797F3C3E3BFB99.59252109...