Capítulo 14 Listas

# -----------------------------------------------------------------------------
# Listas
# -----------------------------------------------------------------------------
# Gerando listas
#list() esta é a função
l1 = list(c(2, 6, 8),
           matrix(seq(1, 4),
                  ncol = 2),
           'ivan')
l1

## [[1]]
## [1] 2 6 8
## 
## [[2]]
##      [,1] [,2]
## [1,]    1    3
## [2,]    2    4
## 
## [[3]]
## [1] "ivan"

dad1 = data.frame(var1 = rnorm(10),
                  var2 = rnorm(10))
dad2 = data.frame(var3 = letters[1:4],
                  var4 = rnorm(4))

l2 = list(s1 = dad1,
          s2 = dad2,
          s3 = 1:10,
          s4 = matrix(1:12,
                      nr = 3,
                      nc = 4))

# Indexando listas
l1[[1]]

## [1] 2 6 8

l1[[2]][1, 2]

## [1] 3

l1[[1]][3]

## [1] 8

l2[[2]]

##   var3       var4
## 1    a  0.9642239
## 2    b -1.4082266
## 3    c -0.5658191
## 4    d  0.2039330

l2$s2

##   var3       var4
## 1    a  0.9642239
## 2    b -1.4082266
## 3    c -0.5658191
## 4    d  0.2039330

l2$s2[['var3']]

## [1] "a" "b" "c" "d"

l2$s2[, 2]

## [1]  0.9642239 -1.4082266 -0.5658191  0.2039330

# Nomeando uma lista
names(l1) = c('A','B','C')