如果我有數值的陣列,其不得不使用對象指針代替值作爲數據類型,由於不等矢量長度: In [145]: import numpy as np
In [147]: a = np.array([[1,2],[3,4,5]])
In [148]: a
Out[148]: array([[1, 2], [3, 4, 5]], dtype=object)
In [150]: np.sin(a)
我試圖獲取電池狀態。我用這個代碼: public class BatteryLevelReceiver extends BroadcastReceiver {
SharedPreferences prefs;
int scale = -1;
int level = -1;
@Override
public void onReceive(Context context, Intent i