如何在循环内在R中的数据框中创建新列并向其中添加新列？

Question

I want to create a new dataframe and keep adding variables in R with in a for loop. Here is a pseudo code on what I want:

X <- 100  
For(i in 1:X)  
{  
  #do some processing and store it a variable named "temp_var"

  temp_var[,i] <- z 
  #make it as a dataframe and keep adding the new variables until the loop completes  
}

After completion of the above loop the vector "temp_var" by itself should be a dataframe containing 100 variables.

Answer 1

I would avoid using for loops as much as possible in R . If you know your columns before hand, lapply is something you want to use.

However, if this is constraint by your program, you can do something like this:

X <- 100
tmp_list <- list()
for (i in 1:X) {
    tmp_list[[i]] <- your_input_column
}
data <- data.frame(tmp_list)
names(data) <- paste0("col", 1:X)