[R] Need Help - R Programming - Using iteration value to change field names for processing for every iteraion

[Vijaya Kumar Regati]

Hi,

I am new to R programming, I am trying to work on below requirement. But could not achieve desired result.
Appreciate if someone can help me on this :

test dataframe :
  Day1.balc Day2.balc Day3.balc Day4.balc
x       100        20        30        40
y       100        10        10        10
> class(test)
[1] "data.frame"

My Goal is to accomplish :
Day2.balc <- Day2.balc + Day1.balc
Day3.balc <- Day3.balc + Day2.balc
.
.
.
Day30.balc <- Day30.balc + Day29.balc

    # Testing for first 4 days
    for (i in 1:4 ) {
    test$Day[i].balc <- test$Day[i].balc + test$Day[i-1].balc
    }

I identified the line I have written inside the loop is not the correct one, can someone help me how I can use iteration value(i), for every iteration, as a basis for changing field names since field consists of 1,2,3... for each different day( Day1.balc Day2.balc Day3.balc Day4.balc etc.,).


Thanks,

Vijay



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