Suppose $y = (y_1, \dots, y_n)$ is a vector, how to express the relation, take logarithm $\log{y_i}$ or $y_i^r$ to each element, just $\log y$ and $y^r$ is Ok?
2026-03-27 23:36:01.1774654561
what is the notation of nonlinear transformation of vector
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