在比较运算中用不带正负号的变数与零比较。
An unsigned variable was used in a comparison operation with zero.
该方法是在传统的两态滞环控制的基础上，增加过零比较器，通过优化逆变器的开关逻辑，从而实现滞环控制下并网逆变器的三态输出。
Through adding a zero-crossing comparator and optimizing the inverter switching logic, this method which is based on the traditional two-state hysteresis control can achieve three-state outputs.
另一方面，如果大多数矢量的大多数值都是非零的，则比较适合使用DenseVector。
On the other hand, if most values for most vectors are non-zero, then a DenseVector is more appropriate.
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