Here we have an existing column present in the data frame. from the existing column Marks, we will create a new column whose values will the calculated value from the Marks column. And the name of the new column will be NewMarks.
# input code
Student <- data.frame(
RollNo = 1:10,
Marks = c(10, 20, 30, 40, 50, 60, 70, 80, 90, 95),
PassOrFail = c(F, F, F, F, F, T, T, T, T, T))
# code for output
> # add marks to each student and creating a new column
> Student$NewMarks <- Student$Marks + 5
<img src="/library/images-tutorials/add-a-new-column-data-frame-calculation.png" alt="data frame, r language" class="img-responsive">
> str(Student)
'data.frame': 10 obs. of 5 variables:
$ RollNo : int 1 2 3 4 5 6 7 8 9 10
$ Marks : num 10 20 30 40 50 60 70 80 90 95
$ PassOrFail : logi TRUE TRUE TRUE TRUE TRUE TRUE ...
$ StudentName: chr "Rumman" "Inza" "Jaman" "Azam" ...
$ NewMarks : num 15 25 35 45 55 65 75 85 95 100
First understand the algorithm carefully. Then study the program line-by-line and compare it with the output. Finally, review the explanation section to strengthen your logic and programming understanding.
Rewrite the program without looking at the code. Modify values, conditions or logic and run it again. This helps improve confidence and strengthens coding skills much faster.