cbind和結合在R

Question

我有點困惑在這裏： 我有這個變量gene <-c("IDH3G", "SSR4")。當我做 c(gene,gene)，我得到： "IDH3G" "SSR4" "IDH3G" "SSR4"，但是當我做cbind (gene, gene)，我得到：

gene gene 
[1,] "IDH3G" "IDH3G" 
[2,] "SSR4" "SSR4" 

不應該這個是一樣的我們從c(gene,gene)得到什麼？有人可以澄清？

Answer 1

c函數結合了矢量並生成一個矢量字符。

class(c(gene,gene)) 
[1] "character" 

但cbind (gene, gene)考慮gene作爲垂直向量，並結合他們作出一個矩陣：

class(cbind (gene, gene)) 
[1] "matrix" 

從r幫助?cbind：

的行或列

合併[R對象

描述：

Take a sequence of vector, matrix or data-frame arguments and 
combine by _c_olumns or _r_ows, respectively. These are generic 
functions with methods for other R classes.