基本関数1 まず最初に理解すべき関数 ?, str 重要な演算子および代入演算子 %in%, match, =, <-, <<- $, [, [[, head, tail, subset, with, assign, get 比較 all.equal, identical !=, ==, >, >=, <, <= is.na, complete.cases, is.finitel 基本的な算術関数 *, +, -, /, ^, %%, %/%, abs, sign acos, asin, atan, atan2, sin, cos, tan ceiling, floor, round, trunc, signif exp, log, log10, log2, sqrt, max, min, prod, sum cummax, cummin, cumprod, cumsum, diff pm