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KIO4_SliderRange拓展：具有两个范围的滑块 - App Inventor 2 拓展 - 清泛I...
具有两个范围的滑块，效果如下：
[hide]来源：https://community.appinventor.mi ... o-ranges-free/29465
http://kio4.com/appinventor/294K_extension_crear_Deslizador.htm
[/hide]
Which is more preferable to use: lambda functions or nested functions ('def')?
...n you tell me what this does:
str(reduce(lambda x,y:x+y,map(lambda x:x**x,range(1,1001))))[-10:]
I wrote it, and it took me a minute to figure it out. This is from Project Euler - i won't say which problem because i hate spoilers, but it runs in 0.124 seconds :)
...
How to detect a Christmas Tree? [closed]
...umber of points does not exceed DBSCAN maximum capacity
Xslice = X[range(0,nsample,int(ceil(float(nsample)/maxpoints)))]
# Translate DBSCAN proximity threshold to units of pixels and run DBSCAN
pixproxthr = proxthresh * sqrt(binimg.shape[0]**2 + binimg.shape[1]**2)
db = DBSCAN(e...
how do i remove a comma off the end of a string?
...and corresponding ltrim for left trim) is very useful as you can specify a range of characters to remove, i.e. to remove commas and trailing whitespace you would write:
$string = rtrim($string, ", \t\n");
share
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Performance of foreach, array_map with lambda and array_map with static function
...nt PHP version.
function lap($func) {
$t0 = microtime(1);
$numbers = range(0, 1000000);
$ret = $func($numbers);
$t1 = microtime(1);
return array($t1 - $t0, $ret);
}
function useForeach($numbers) {
$result = array();
foreach ($numbers as $number) {
$result[] = $number * 10;
...
Break a previous commit into multiple commits
... where <commit> is the commit you want to split. In fact, any commit range will do, as long as it contains that commit.
Mark the commit you want to split with the action "edit".
When it comes to editing that commit, execute git reset HEAD^. The effect is that the HEAD is rewound by one, and ...
Python loop counter in a for loop [duplicate]
...l sometimes do this:
def draw_menu(options, selected_index):
for i in range(len(options)):
if i == selected_index:
print " [*] %s" % options[i]
else:
print " [ ] %s" % options[i]
Though I tend to avoid this if it means I'll be saying options[i] more tha...
tinyxml XML解析库下载（tinyxml2.h 和 tinyxml2.cpp） - 源码下载 - 清泛...
...onality.
*/
class XMLUtil
{
public:
// Anything in the high order range of UTF-8 is assumed to not be whitespace. This isn't
// correct, but simple, and usually works.
static const char* SkipWhiteSpace( const char* p ) {
while( !IsUTF8Continuation(*p) && isspace( *reinter...
What is the difference between a port and a socket?
...RL (although it can be).
In IP networking, port numbers can theoretically range from 0 to 65535. Most popular network applications, though, use port numbers at the low end of the range (such as 80 for HTTP).
Note: The term port also refers to several other aspects of network technology. A port can...
Extracting text OpenCV
....CHAIN_APPROX_NONE)
mask = np.zeros(bw.shape, dtype=np.uint8)
for idx in range(len(contours)):
x, y, w, h = cv2.boundingRect(contours[idx])
mask[y:y+h, x:x+w] = 0
cv2.drawContours(mask, contours, idx, (255, 255, 255), -1)
r = float(cv2.countNonZero(mask[y:y+h, x:x+w])) / (w * h)
...