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How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...ragraph applied to Snow Leopard, but not to Lion, which appears to require 64-bit MySQL
First off, the author (still?) of MySQLdb says here that one of the most pernicious problems is that OS X comes installed with a 32 bit version of Python, but most average joes (myself included) probably jump to...
How do I print a double value with full precision using cout?
... value anyways. I think g++ supports this.)
union {
double d;
uint64_t u64;
} x;
x.d = 1.1;
std::cout << std::hex << x.u64;
This will give you the 100% accurate precision of the double... and be utterly unreadable because humans can't read IEEE double format ! Wikipedia has a ...
C++ preprocessor __VA_ARGS__ number of arguments
...
HolyBlackCat
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answered Jan 23 '10 at 19:22
Kornel KisielewiczKornel Kisielew...
MIN/MAX vs ORDER BY and LIMIT
.... As a meaningless data point, MIN() took .36s while SORT and LIMIT took .84s against a 106,000 row table on my dev server.
If, however, you're looking at an indexed column, the difference is harder to notice (meaningless data point is 0.00s in both cases). Looking at the output of explain, howev...
Why does std::getline() skip input after a formatted extraction?
...
0x499602D20x499602D2
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...
Apply pandas function to column to create multiple new columns?
... 1 1 1
2 2 2 4 8 16 32 64
3 3 3 9 27 81 243 729
4 4 4 16 64 256 1024 4096
5 5 5 25 125 625 3125 15625
6 6 6 36 216 ...
Override intranet compatibility mode IE8
...
84
Michael Irigoyen is correct BUT it is a little more complicated...
if you are using the wonder...
How do I find the MySQL my.cnf location
...trace mysql ";" 2>&1 | grep cnf
on my machine this outputs:
stat64("/etc/my.cnf", 0xbf9faafc) = -1 ENOENT (No such file or directory)
stat64("/etc/mysql/my.cnf", {st_mode=S_IFREG|0644, st_size=4271, ...}) = 0
open("/etc/mysql/my.cnf", O_RDONLY|O_LARGEFILE) = 3
read(3, "# /etc/mysql/...
“ArrayAdapter requires the resource ID to be a TextView” xml problems
...
LuksprogLuksprog
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...
np.mean() vs np.average() in Python NumPy?
... axes 0 and 1, I get wildly incorrect results unless I specify dtype='float64':
>T.shape
(4096, 4096, 720)
>T.dtype
dtype('<f4')
m1 = np.average(T, axis=(0,1)) # garbage
m2 = np.mean(T, axis=(0,1)) # the same garbage
m3 = np.mean(T, axis=(0,1), dtype='fl...