Floor[x]x 以下の最大の整数(切り下げ)を返す.
Floor[x, a]x 以下で最大の a の倍数を与える.
最も近い整数に切り下げる:
最も近い10の倍数に切り下げる:
Ceiling Round IntegerPart Chop Piecewise BinCounts Quantile FindDivisions
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