How to Create a Data Frame Row by Row in R (Example Code)

my_data <- data.frame(col1 = numeric(),    # Creating empty data
                      col2 = numeric(),
                      col3 = character(),
                      col4 = character(),
                      stringsAsFactors = FALSE)
my_data                                    # Showing data in RStudio console
# [1] col1 col2 col3 col4
# <0 rows> (or 0-length row.names)

my_data <- data.frame(col1 = numeric(), # Creating empty data col2 = numeric(), col3 = character(), col4 = character(), stringsAsFactors = FALSE) my_data # Showing data in RStudio console # [1] col1 col2 col3 col4 # <0 rows> (or 0-length row.names)

for(idx in 1:10) {                         # Starting for-loop
  list_one_row <- c(idx + 10,              # Constructing some data for one row
                    idx / 5,
                    letters[idx + 5],
                    "XXX")
  my_data[idx, ] <- list_one_row           # Appending values at tail of data frame
}

for(idx in 1:10) { # Starting for-loop list_one_row <- c(idx + 10, # Constructing some data for one row idx / 5, letters[idx + 5], "XXX") my_data[idx, ] <- list_one_row # Appending values at tail of data frame }

my_data                                    # Showing updated data in RStudio console
#    col1 col2 col3 col4
# 1    11  0.2    f  XXX
# 2    12  0.4    g  XXX
# 3    13  0.6    h  XXX
# 4    14  0.8    i  XXX
# 5    15    1    j  XXX
# 6    16  1.2    k  XXX
# 7    17  1.4    l  XXX
# 8    18  1.6    m  XXX
# 9    19  1.8    n  XXX
# 10   20    2    o  XXX

my_data # Showing updated data in RStudio console # col1 col2 col3 col4 # 1 11 0.2 f XXX # 2 12 0.4 g XXX # 3 13 0.6 h XXX # 4 14 0.8 i XXX # 5 15 1 j XXX # 6 16 1.2 k XXX # 7 17 1.4 l XXX # 8 18 1.6 m XXX # 9 19 1.8 n XXX # 10 20 2 o XXX