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How do I expire a PHP session after 30 minutes?
... session.gc_divisor. And using the default values for those options (1 and 100 respectively), the chance is only at 1%.
Well, you could simply adjust these values so that the garbage collector is started more often. But when the garbage collector is started, it will check the validity for every reg...
水果vs蔬菜智能分类器 - EdgeML图像识别项目 · App Inventor 2 中文网
...不同商店的价格
技术实现：
集成价格数据库
地理位置服务
条形码扫描
在线支付接口
4. 农业应用
应用场景：
作物识别: 农民识别田间的作物种类
成熟度判断: 通过图像判断水果成熟度
病虫害...
Why can't variable names start with numbers?
...ire the uses of spaces. So, basically, the following are identical:
10 V1=100
20 PRINT V1
and
10V1=100
20PRINTV1
Now suppose that numeral prefixes were allowed. How would you interpret this?
101V=100
as
10 1V = 100
or as
101 V = 100
or as
1 01V = 100
So, this was made illegal.
...
Random Gaussian Variables
...
Math.NET provides this functionality. Here's how:
double mean = 100;
double stdDev = 10;
MathNet.Numerics.Distributions.Normal normalDist = new Normal(mean, stdDev);
double randomGaussianValue= normalDist.Sample();
You can find documentation here:
http://numerics.mathdotnet.com/api/M...
How to programmatically take a screenshot on Android?
...ream outputStream = new FileOutputStream(imageFile);
int quality = 100;
bitmap.compress(Bitmap.CompressFormat.JPEG, quality, outputStream);
outputStream.flush();
outputStream.close();
openScreenshot(imageFile);
} catch (Throwable e) {
// Several e...
What is the best way to concatenate two vectors?
... [](int& f)->void
{
f = rand() % 100;
});
std::cout << "before merge: " << toString(A) << "\n";
std::cout << "before merge: " << toString(B) << "\n";
merge(B.begin(),B.end(), begin(A), end(A), AB.b...
CMFCTabCtrl的使用、颜色样式调整 - C/C++ - 清泛网 - 专注C/C++及内核技术
...b、设置Tab样式，AutoColor自动设置Tab颜色效果等。1.在指定位置处创建一个CMFCTabCtrl，并给其添加4个CEdit:
CRect rectTab;
CEdit m_wnd1;
CEdit m_wnd2;
CEdit m_wnd3;
CEdit m_wnd4;
CMFCTabCtrl m_wndTab;
m_wndTabLoc.GetWindowRect (&rectTab);
ScreenToClient (&rec...
计算统计特征（正态分布）函数及实例 - C/C++ - 清泛网 - 专注C/C++及内核技术
...nt argc, _TCHAR* argv[])
{
std::map<int, int> map_test;
map_test[0] = 100;
map_test[5] = 80;
map_test[2] = 10;
map_test[8] = 99;
map_test[4] = 102;
StdevInfo stdev_info;
stdev_info.init();
stdev_info.caculate_stdev_info(map_test.begin(), map_test.end(),
[](const std::pair<i...
PDO Prepared Inserts multiple rows in single query
...ray_push() to create $insert_values instead of array_merge() resulted in a 100X speed up with execution time of 0.41s.
The problematic array_merge():
$insert_values = array();
foreach($data as $d){
$question_marks[] = '(' . placeholders('?', sizeof($d)) . ')';
$insert_values = array_merge($ins...
VC MFC工具栏(CToolBar)控件 - C/C++ - 清泛网 - 专注C/C++及内核技术
...00,200,200);//
m_Toolbar.MoveWindow(rect);//移动工具栏在父窗口的位置
m_Toolbar.ShowWindow(SW_SHOW);//显示工具栏
但这样显示工具栏不是很方便，特别是当窗口大小改变后，还要计算工具栏在窗口中的位置，有没有什么方法，可以根据窗口大...