什麼是 list？

R for Finance 入門

Lore Dirick

Manager of Data Science Curriculum at Flatiron School

List

cash

  company cash_flow year
1       A      1000    1
2       A      4000    3
3       A       550    4
4       B      1500    1
5       B      1100    2
6       B       750    4
7       B      6000    5

company_name <- "DataCampers Inc"

List

my_company <- list(company_name, cash)

my_company

[[1]]
"DataCampers Inc."
[[2]]
  company cash_flow year
1       A      1000    1
2       A      4000    3
3       A       550    4
4       B      1500    1
5       B      1100    2
6       B       750    4
7       B      6000    5

擷取 list 元素

my_company[1]

[[1]]
"DataCampers Inc."

my_company[[1]]

"DataCampers Inc."

my_company[[2]]

  company cash_flow year
1       A      1000    1
2       A      4000    3
3       A       550    4
4       B      1500    1
5       B      1100    2
6       B       750    4
7       B      6000    5

一起來練習吧！

R for Finance 入門