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# Octave 常用函数
```m
A=bitshift(A，k) % 返回移位了 k 位的 A 的值。当 K>0 时左移，当 k<0 时右移。
seconds=time() % Return the current time as the number of seconds since the epoch.
t=now() % Return the current local date/time as a serial day number (see datenum).
```