Concatenate Two data.table Objects Vertically in R (Example Code)

install.packages("data.table")          # Install data.table package
library("data.table")                   # Load data.table

install.packages("data.table") # Install data.table package library("data.table") # Load data.table

dt_A <- data.table(A = 10:5,            # Create two data.tables
                   B = letters[10:5])
dt_A
#     A B
# 1: 10 j
# 2:  9 i
# 3:  8 h
# 4:  7 g
# 5:  6 f
# 6:  5 e

dt_A <- data.table(A = 10:5, # Create two data.tables B = letters[10:5]) dt_A # A B # 1: 10 j # 2: 9 i # 3: 8 h # 4: 7 g # 5: 6 f # 6: 5 e

dt_B <- data.table(A = 21:15,
                   B = letters[21:15])
dt_B
#     A B
# 1: 21 u
# 2: 20 t
# 3: 19 s
# 4: 18 r
# 5: 17 q
# 6: 16 p
# 7: 15 o

dt_B <- data.table(A = 21:15, B = letters[21:15]) dt_B # A B # 1: 21 u # 2: 20 t # 3: 19 s # 4: 18 r # 5: 17 q # 6: 16 p # 7: 15 o

dt_AB <- rbindlist(list(dt_A, dt_B))    # Concatenate two data.tables
dt_AB
#      A B
#  1: 10 j
#  2:  9 i
#  3:  8 h
#  4:  7 g
#  5:  6 f
#  6:  5 e
#  7: 21 u
#  8: 20 t
#  9: 19 s
# 10: 18 r
# 11: 17 q
# 12: 16 p
# 13: 15 o

dt_AB <- rbindlist(list(dt_A, dt_B)) # Concatenate two data.tables dt_AB # A B # 1: 10 j # 2: 9 i # 3: 8 h # 4: 7 g # 5: 6 f # 6: 5 e # 7: 21 u # 8: 20 t # 9: 19 s # 10: 18 r # 11: 17 q # 12: 16 p # 13: 15 o