發(fā)簡(jiǎn)信
IP屬地：廣東
1、計(jì)算向量長(zhǎng)度：length() 2秩贰、求和：sum() sum(..., na.rm = FALSE) 3惫确、計(jì)算平均值：mean() mean...
創(chuàng)建向量和矩陣 1、新建向量：c() 2缭召、新建連續(xù)有規(guī)則向量：seq() seq(from = 1, to = 1, by = ((to - f...
1. strsplit {base} 語(yǔ)法： strsplit(x, split, fixed = FALSE, perl = FALSE, u...
1. paste {base} 語(yǔ)法： paste (..., sep = " ", collapse = NULL)paste0(..., c...