Because the most common case for using a blessed scalar reference is to perform glue magic, Pixie by default will consider these objects unstorable.

因为使用经过 bless 的标量引用最常见的情形就是执行粘接魔术（glue magic），所以 Pixie 在缺省情况下会认为这些对象是不可存储的。

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The repetitive control algorithm includes scalar gain of the reference input with a lead block in the signal generator. A second-order low-pass filter provides compensation in the controller.

该算法中在输入参考信号处直接增加一个比例增益环节，在信号发生器处串联一个超前的时滞环节，并且用一个二阶低通滤波器作为控制系统的补偿函数。

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