[datatable-help] Simpe script does not finish

[hello_R]

Hi all,
I have a dataframe (512x512). I just want to create a new dataframe from it.
I used the following code. It does not stop running! Could you please help.
Thanks

# Read the text file (512x512)
df<-read.table("out_1_1.txt")

d=NULL
for (i in 0:511){
  for (j in 0:511){
    Myrow<-c(i,j,df[i+1,j+1])
    d=rbind(d,Myrow)
  }
} 




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