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1中文定義

數學中,一個實數函數被稱為階段函數(或者階梯函數),則它可以被寫作:有限的間隔指標函數的線性組合。不正規的說法是,一個階段函數就是一個分段常值函數,只是含有的階段很多但是有限。

2英文定義

In mathematics, a function on the real numbers is called a step function (or staircase function) if it can be written as a finite linear combination of indicator functions of intervals. Informally speaking, a step function is a piecewise constant function having only finitely many pieces.
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