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How do you Force Garbage Collection from the Shell?
...ith jmap on a remote box and I want to force garbage collection on it. How do you do this without popping into jvisualvm or jconsole and friends?
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Linear Regression and group by in R
I want to do a linear regression in R using the lm() function. My data is an annual time series with one field for year (22 years) and another for state (50 states). I want to fit a regression for each state so that at the end I have a vector of lm responses. I can imagine doing for loop for each ...
How do I convert a string to a number in PHP?
...
You don't typically need to do this, since PHP will coerce the type for you in most circumstances. For situations where you do want to explicitly convert the type, cast it:
$num = "3.14";
$int = (int)$num;
$float = (float)$num;
...
How to deploy correctly when using Composer's develop / production switch?
...Well, the composer.json and composer.lock file should be committed to VCS. Don't omit composer.lock because it contains important information on package-versions that should be used.
When performing a production deploy, you can pass the --no-dev flag to Composer:
composer.phar install --no-dev
T...
How do I make HttpURLConnection use a proxy?
If I do this...
7 Answers
7
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Python + Django page redirect
How do I accomplish a simple redirect (e.g. cflocation in ColdFusion, or header(location:http://) for PHP) in Django?
1...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...WiFi状态检查
// 检查WiFi状态
when Screen1.Initialize
do
if WiFi1.IsEnabled then
set Label1.Text to "WiFi已启用"
set Label2.Text to "当前IP: " & WiFi1.LocalIP
set Label3.Text to "当前SSID: " & WiFi1.SSID
else
set Label1.Text to "WiF...
How do I compute derivative using Numpy?
How do I calculate the derivative of a function, for example
8 Answers
8
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How to articulate the difference between asynchronous and parallel programming?
...running asynchronously so it didn't lock up your UI and you could continue doing other things. Now, each frame of that animation can also be considered as an individual task. If we have multiple CPUs/Cores or multiple machines available, we can render multiple frames in parallel to speed up the over...
What is the JavaScript >>> operator and how do you use it?
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It doesn't just convert non-Numbers to Number, it converts them to Numbers that can be expressed as 32-bit unsigned ints.
Although JavaScript's Numbers are double-precision floats(*), the bitwise operators (<<, >>, ...