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扩展App Inventor：具有多点触控和手势检测功能 · App Inventor 2 中文网
...mmed by Blockly, a visual block-based programming framework. There are basically two parts in an App Inventor app: components and programming blocks. A component is an item that the app can use. It could be visible on the phone screen such as a button or label, or it could be non-visible, such as a ...
Call a global variable inside module
I have a typescript file called Projects.ts that I want to reference a global variable declared in a bootstrap plugin called bootbox.js .
...
AWS S3 copy files and folders between two buckets
...hrows the following error A client error (PermanentRedirect) occurred when calling the ListObjects operation: The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint.
– Giovanni Bitliner
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How do I clear stuck/stale Resque workers?
...esn't include a check for whether the worker should be unregistered before calling unregister_worker? Is there a way to determine this?
– user5243421
May 10 '15 at 4:51
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Safe String to BigDecimal conversion
...
The following sample code works well (locale need to be obtained dynamically)
import java.math.BigDecimal;
import java.text.NumberFormat;
import java.text.DecimalFormat;
import java.text.ParsePosition;
import java.util.Locale;
class TestBigDecimal {
public static void main(String[] args) {...
Get first key in a (possibly) associative array?
...
2019 Update
Starting from PHP 7.3, there is a new built in function called array_key_first() which will retrieve the first key from the given array without resetting the internal pointer. Check out the documentation for more info.
You can use reset and key:
reset($array);
$first_key = key...
JavaScript: location.href to open in new window/tab?
...
You can also open a new tab calling to an action method with parameter like this:
var reportDate = $("#inputDateId").val();
var url = '@Url.Action("PrintIndex", "Callers", new {dateRequested = "findme"})';
window.open(window.location.href = ur...
Changing the width of Bootstrap popover
... element. The new Bootstrap ensures that if you use form-control you basically have a full-width input element.
23 Answer...
What is an Intent in Android?
...can use to request an action from another app component
An Intent is basically a message to say you did or want something to happen. Depending on the intent, apps or the OS might be listening for it and will react accordingly. Think of it as a blast email to a bunch of friends, in which you tell y...
How do you get the magnitude of a vector in Numpy?
...s per loop
There does, however, seem to be some overhead associated with calling it that may make it slower with small inputs:
In [2]: a = np.arange(100)
In [3]: %timeit np.sqrt(a.dot(a))
100000 loops, best of 3: 3.73 µs per loop
In [4]: %timeit np.sqrt(np.einsum('i,i', a, a))
100000 loops, be...