fourier discovered that a nonsinusoidal periodic function can
the endogenous function of each of a cd5, b bcma, c cd33, d
sum(difference)rule: x lim f x m x and
σ(z):sigmoid function; xi:inputstep2:goodness of a function设
c 中newton插值——计算差商表差商(difference quotient)定义一,用
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