Ratios[list]给出 list 中元素的连续比率.
Ratios[list, n]给出 list 中第 n迭代比率.
Ratios[list, {n1, n2, ...}]给出嵌套列表中第 k 层的连续第 比率.
第一次比率:
第二次比率:
Differences Divide FoldList DiscreteRatio
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