Extra columns appearing while running loop in R -


i have data frame following:

     word count    word  tf score word probability log values tfxidf score 1   yemen   380   yemen 1.0000000       0.05393896   2.919902     2.919902 2 strikes   116 strikes 0.3052632       0.01646558   4.106483     1.253558

but when run following code:

p1 <- read.csv("f:/m.tech/semester4/thesis/code/a1.csv") x <- nrow(p1) q <- p1[1,2]  for(i in 1:x) {   p1[i,4]=p1[i,2]/q }  for(i in 1:x) {   p1[i,5]=p1[i,2]/p }  for(i in 1:x) {   p1[i,6]= -log(p1[i,5]) }  for(i in 1:x) {   p1[i,7]= p1[i,4]*p1[i,6] }

i other data frame columns as:

   na    word count    word  tf score word probability log values tfxidf score keyword probability 1   1   yemen   380   yemen 1.0000000       0.05393896   2.919902     2.919902                  na 2   2 strikes   116 strikes 0.3052632       0.01646558   4.106483     1.253558                 0.5

how can remove these columns coming?


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