什么是列表？

R 金融入门

Lore Dirick

Manager of Data Science Curriculum at Flatiron School

列表

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"

列表

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

列表子集

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

Passons à la pratique !

R 金融入门