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终于等到！AppInventor2 中文网已升级v2.72，全面支持Android 14 - App Inv...
MIT 刚升级 v2.72，支持安卓 14， 这是一个组件版本。
此版本专注于更新 Android Companion 应用及其底层框架。新版本 2.72 现已可从 Google Play 商店和 ai2.appinventor.mit.edu（版本 2.72u）直接下载。
此版本中的关键变化是将 Android SDK ...
Why do we need virtual functions in C++?
...o main() -> int
{
Number const a( 3.14 );
Number const b( 2.72 );
Number const c( 1.0 );
Sum const sum_ab( &a, &b );
Sum const sum( &sum_ab, &c );
cout << sum.value() << endl;
}
In the line commented as “bad” the Exp...
Rank items in an array using Python/NumPy, without sorting array twice
...meit -n10000 -r5
x = (rankdata(l) - 1).astype(int)
>>> 128 µs ± 2.72 µs per loop (mean ± std. dev. of 5 runs, 10000 loops each)
%%timeit -n10000 -r5
a = np.array(l)
r = a.argsort().argsort()
>>> 69.1 µs ± 464 ns per loop (mean ± std. dev. of 5 runs, 10000 loops each)
%%tim...
Android accelerometer accuracy (Inertial navigation)
...now is historically, when this pattern occurs, the device is traveling and 2.72 m/s X, 0.17m/s Y, 0.01m/s Z, so the device must be doing that now. And it would move the piece forward accordingly. It's important that it's completely blind, because just putting a phone in your pocket might be oriented...