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What integer hash function are good that accepts an integer hash key?
...
Knuth's multiplicative method:
hash(i)=i*2654435761 mod 2^32
In general, you should pick a multiplier that is in the order of your hash size (2^32 in the example) and has no common factors with it. This way the hash function covers all your hash space uniformly.
Edit: The b...
How do I detect unsigned integer multiply overflow?
...ed ints representing mathematical positive integers, not positive integers mod 2^32 (or 2^64). The distinction between overflow as a deviation from mathematical infinite-sized integer behaviour, and overflow as an undefined behaviour in the language seems rarely to be made explicit.
...
What's the algorithm to calculate aspect ratio?
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function gcd (a,b):
if b == 0:
return a
return gcd (b, a mod b)
In C:
static int gcd (int a, int b) {
return (b == 0) ? a : gcd (b, a%b);
}
int main(void) {
printf ("gcd(1024,768) = %d\n",gcd(1024,768));
}
And here's some complete HTML/Javascript which shows one way t...
Maximum on http header values?
...the value on apache 2.4 which remains the same : httpd.apache.org/docs/2.4/mod/core.html#limitrequestfieldsize : Apache 2.0, 2.2,2.4: 8K
– Med Ali Difallah
Apr 4 '17 at 14:15
...
How does the MapReduce sort algorithm work?
... in the partitioning (after map, before reduce).
The paper uses hash(key) mod R as the partitioning example, but this is not the only way to partition intermediate data to different reduce tasks.
Just add boundary conditions to @Yuval F 's answer to make it complete: suppose min(S) and max(S) is t...
How to pretty-print a numpy.array without scientific notation and with given precision?
... __file__, m, n, X )
print( title )
...
pl.title( title )
Module globals:
_fmt = "%.3g" # default for extra args
_squeeze = np.squeeze # (n,1) (1,n) -> (n,) print in 1 line not n
See also:
http://docs.scipy.org/doc/numpy/reference/generated/numpy.set_printoptions.html
http://d...
Syntax behind sorted(key=lambda: …)
...ue seems to be telling my sorted function to prioritize evens by using the mod operator in x%2==0). Second, why are my evens out of order? 2 comes before 6 right? By analyzing this result, we'll learn something deeper about how the sorted() 'key' argument works, especially in conjunction with the an...
“Insufficient Storage Available” even there is lot of free space in device memory
...hat works on my Samsung Galaxy S II and Note 1; I have no idea about other models:
Open the phone app and switch to keypad.
Dial *#9900#
On the screen that appears, click on the button labelled "Delete dumpstate/logcat".
I've restored about one GB of system space this way.
...
PHP memory profiling
...bian1
sudo pecl install memprof
echo "extension=memprof.so" > /etc/php5/mods-available/memprof.ini
sudo php5enmod memprof
service apache2 restart
And then in my code:
<?php
memprof_enable();
// do your stuff
memprof_dump_callgrind(fopen("/tmp/callgrind.out", "w"));
Finally open the callgr...
Lua简明教程 - 脚本技术 - 清泛IT论坛，有思想、有深度
...r/local/bin/lua
print("Hello, World")
chenhao-air:lua chenhao$ chmod +x hello.lua
chenhao-air:test chenhao$ ./hello.lua
Hello, World复制代码
语法注释 -- 两个减号是行注释
--[[
这是块注释
这是块注释
变量Lua的数字只有double型，64bits，...