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And then I just replace this with elapsedTime in the sign function.
然后我将其替换为符号函数中的 elapsedTime 。
符号函数(Sign function,简称sgn)是一个逻辑函数,用以判断实数的正负号。为避免和英文读音相似的正弦函数(sine)混淆,它亦称为Signum function。其定义为:
In mathematics, the sign function or signum function (from signum, Latin for "sign") is an odd mathematical function that extracts the sign of a real number. In mathematical expressions the sign function is often represented as sgn.
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