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Fast check for NaN in NumPy
...00 loops, best of 3: 244 us per loop
In [14]: %timeit np.isnan(np.sum(x))
10000 loops, best of 3: 97.3 us per loop
Unlike min, sum doesn't require branching, which on modern hardware tends to be pretty expensive. This is probably the reason why sum is faster.
edit The above test was performed wi...
List comprehension on a nested list?
...timeit "[list(map(float,k)) for k in [list(range(0,10))]*10]"
>>> 100000 loops, best of 3: 15.2 usec per loop
>>> python -m timeit "[[float(y) for y in x] for x in [list(range(0,10))]*10]"
>>> 10000 loops, best of 3: 19.6 usec per loop
>>> python -m timeit "[...
What is the JavaScript convention for no operation?
... // Define in ES6 as Lambda (arrow function)
setTimeout(noop, 10000); // Using the predefined noop
setTimeout(function () {} , 10000); // Using directly in ES3 or ES5
setTimeout(() => {} , 10000); // Using directly in ES6 as Lambda (arrow function)
setTimeout(an...
PHP best way to MD5 multi-dimensional array?
...:{}}}}}}}}}');
//The serialize test
$b4_s = microtime(1);
for ($i=0;$i<10000;$i++) {
$serial = md5(serialize($array));
}
echo 'serialize() w/ md5() took: '.($sTime = microtime(1)-$b4_s).' sec<br/>';
//The json test
$b4_j = microtime(1);
for ($i=0;$i<10000;$i++) {
$serial = md5(...
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What are invalid characters in XML
... Char ::= #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] /* any Unicode character, excluding the surrogate blocks, FFFE, and FFFF. */
Basically, the control characters and characters out of the Unicode ranges are not allowed.
This means also that calling for exam...
Call js-function using JQuery timer
...
You can use this:
window.setInterval(yourfunction, 10000);
function yourfunction() { alert('test'); }
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Find element's index in pandas Series
...l)
Uses a hashtable internally, so fast
In [7]: s = Series(randint(0,10,10000))
In [9]: %timeit s[s == 5]
1000 loops, best of 3: 203 µs per loop
In [12]: i = Index(s)
In [13]: %timeit i.get_loc(5)
1000 loops, best of 3: 226 µs per loop
As Viktor points out, there is a one-time creation ove...
What is the size of column of int(11) in mysql in bytes?
...RSET=utf8;
INSERT INTO `mytable`
(`int1`, `int2`, `zf1`, `zf2`)
VALUES
(10000, 10000, 10000, 10000),
(100, 100, 100, 100);
select * from mytable;
which will output:
+----+-------+-------+------------+-------+
| id | int1 | int2 | zf1 | zf2 |
+----+-------+-------+------------+-----...
What are the differences between json and simplejson Python modules?
...chmark:
import json
import simplejson
from timeit import repeat
NUMBER = 100000
REPEAT = 10
def compare_json_and_simplejson(data):
"""Compare json and simplejson - dumps and loads"""
compare_json_and_simplejson.data = data
compare_json_and_simplejson.dump = json.dumps(data)
assert...