行列の形を保ったまま関数を適応する方法についてのメモ
m <- c(1:9, 3, 3)
structure(sapply(m, sqrt), dim=m))
structure(vapply(m, sqrt, numeric(1)), dim=m))
m[] <- sapply(m, sqrt)
m[] <- vapply(m, sqrt, numeric(1))
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