### -----------------------------------------------------------------------
### Autor: Paul Fink, et. al. (Stand: SoSe 2017)
### -----------------------------------------------------------------------


## ----prevobejcts---------------------------------------------------------
numvec <- c(2.54, 4.22, 2.99, 3.14, 3.44)
charvec <- c("Statistische", "Software")
logicvec <- c(TRUE, FALSE, FALSE, TRUE)

## ----list1---------------------------------------------------------------
mat <- matrix(seq(from = 2, by = 3, length = 12), nrow = 3) 
list1 <- list(numeric = numvec, character = charvec,
              matrix = mat)
list1

## ----list2---------------------------------------------------------------
list2 <- list(logicvec, list = list1)
list2

## ----listzugriff1--------------------------------------------------------
list1[[1]][2]

## ----listzugriff2--------------------------------------------------------
list2$list$numeric[2]

## ----namenabfragen-------------------------------------------------------
names(list1)
names(list2)
names(1:8)

## ----headmtcars----------------------------------------------------------
head(mtcars)

## ----namesdataframe------------------------------------------------------
rownames(mtcars)
colnames(mtcars) # oder 'names(mtcars)'

## ----zugriffdataframeindex-----------------------------------------------
mtcars[1:4,]

## ----zugriffdataframename------------------------------------------------
mtcars$cyl