大约有 47,000 项符合查询结果（耗时：0.0856秒） [XML]
An algorithm for inflating/deflating (offsetting, buffering) polygons
...|
edited Jun 24 '17 at 16:02
Bernhard Barker
49.5k1313 gold badges7777 silver badges118118 bronze badges
...
How to include PHP files that require an absolute path?
...
answered Aug 7 '08 at 4:20
Peter CoultonPeter Coulton
49k1111 gold badges5151 silver badges6969 bronze badges
...
How to split data into training/testing sets using sample function
...ple example:
data(mtcars)
## 75% of the sample size
smp_size <- floor(0.75 * nrow(mtcars))
## set the seed to make your partition reproducible
set.seed(123)
train_ind <- sample(seq_len(nrow(mtcars)), size = smp_size)
train <- mtcars[train_ind, ]
test <- mtcars[-train_ind, ]
...
convert UIImage to NSData
...
|
edited May 10 '19 at 17:02
Cœur
29.8k1515 gold badges166166 silver badges214214 bronze badges
...
MySQL, better to insert NULL or empty string?
...re differences:
A LENGTH of NULL is NULL, a LENGTH of an empty string is 0.
NULLs are sorted before the empty strings.
COUNT(message) will count empty strings but not NULLs
You can search for an empty string using a bound variable but not for a NULL. This query:
SELECT *
FROM mytable
WHERE ...
Convert Django Model object to dict with all of the fields intact
... OtherModel object>,
'_state': <django.db.models.base.ModelState at 0x7ff0993f6908>,
'auto_now_add': datetime.datetime(2018, 12, 20, 21, 34, 29, 494827, tzinfo=<UTC>),
'foreign_key_id': 2,
'id': 1,
'normal_value': 1,
'readonly_value': 2}
This is by far the simplest, but is mis...
Unicode character in PHP string
...xxx syntax the first thing that comes into my mind is:
$unicodeChar = '\u1000';
echo json_decode('"'.$unicodeChar.'"');
Another option would be to use mb_convert_encoding()
echo mb_convert_encoding('&#x1000;', 'UTF-8', 'HTML-ENTITIES');
or make use of the direct mapping between UTF-16BE (b...
Loop inside React JSX
...the arguments to a function call would go:
return tbody(
for (var i = 0; i < numrows; i++) {
ObjectRow()
}
)
See how the function tbody is being passed a for loop as an argument – leading to a syntax error.
But you can make an array, and then pass that in as an argument:
v...
Recursive sub folder search and return files in a list python
...mport glob
result = [y for x in os.walk(PATH) for y in glob(os.path.join(x[0], '*.txt'))]
Also a generator version
from itertools import chain
result = (chain.from_iterable(glob(os.path.join(x[0], '*.txt')) for x in os.walk('.')))
Edit2 for Python 3.4+
from pathlib import Path
result = list(Pa...
Safely turning a JSON string into an object
...
1990
JSON.parse(jsonString) is a pure JavaScript approach so long as you can guarantee a reasonably m...