检查公式,发现以下错误,应该怎么修改呢?
While evaluating "ft_max":
Operation "[ ] sweep access", index out of range in dimension 1, independent "freq" must use an index in the range 0 <= index < 0
If direction = +1, compute positive going zero crossings.
If direction = -1, compute negative going zero crossings.
这里的positive和negative具体指什么?你可以帮忙解释一下这两句话的含义吗?
If direction = 0, compute all zero crossings