用文本数据转置R数据帧

Question

我越来越熟悉R并学习长宽数据帧。我正在使用dcast（和ddply），但据我所知，他们依赖于我的数据。在以下示例中，我有：

data.frame(color=c("red","orange","blue","white"),safe=c("N","N","Y","Y"))

基本上，旧的假设是保险公司惩罚了风险的颜色＆＃34;汽车不太安全。我想要一个把它变成一张宽桌子的命令。是否缺少dcast的风格或语法，将上表变为

red | orange | blue | white
 N  |   N    |  Y   |   Y

感谢您的帮助。

Answer 1

也许是transpose功能？

a <- data.frame(color=c("red","orange","blue","white"),safe=c("N","N","Y","Y"))
# transpose and make it a dataframe.
new_a <- data.frame(t(a), stringsAsFactors=FALSE)
# makes the column names the first row of the new dataframe
names(new_a) <- new_a[1,]
# now you can get rid of the first row.
new_a <- new_a[-1,]
> new_a
     red orange blue white
safe   N      N    Y     Y