For loops in R iterates only the last entry

Question

I want to repeat a column vector that have 300rows about 241times and to concatonate it. The data is downloadable in this link. https://1drv.ms/u/s!AiZLoqatH-p7rD0og-RufSi6fljB

I tried the following code.

read.csv("stack_overflow.csv")
fund_name = d[,1] 
fund_name_panel=c() 
    for (i in 1:300{x1=rep(fund_name[i], 241)  fund_name_Panel=append(x1,fund_name_panel)}

Result: unfortunately, My code repeats only the very last row of the data. How can i repeat each of the 300rows rather than the very last? Any hint is appreciated.

Hi Enrico, please take the time to read the guidance on asking questions, as it will help make it easier for others to assist. Having a reproducible example is important though as it lets other replicate your error: https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example — Michael Harper, Mar 03 '18 at 18:48
I also cannot understand exactly what the question is asking. Does `result <- c(); for(i in 1:300){ result <- append(i, result)}` capture the basic beahviour? — Michael Harper, Mar 03 '18 at 18:54
@MikeyHarper I think, now it's even better explained. I modified it. I appreciate the feedback. — Enrico Dace, Mar 03 '18 at 22:26

score 0 · Answer 1 · edited Oct 24 '21 at 17:33

From your description of the problem you are committing a very simple error a lot of people make when first learning for loops. First since you are making a new variable (fund_name_panel) you need to create an empty vector the length of the vector you will use in the for loop.

fund_name_panel <- numeric(length(fund_name))

Use nrow() instead of length() if fund_name is a data.frame and not a vector.

Secondly, you will need to specify the row (i) in both the now new vector (fund_name_panel) and the vector of you are referencing in the for loop (fund_name) see code below.

fund_name_panel <- numeric(length(fund_name))

for(i in 1:length(fund_name)){
x[i]=y[i]
}

For loops in R iterates only the last entry

1 Answers1