R : Cumulative sum of a column based on the values of another column (R)

R : Cumulative sum of a column based on the values of another column (R)
To Access My Live Chat Page,
On Google, Search for "hows tech developer connect"

As I promised, I have a secret feature to share with you.
This is a YouTube's feature which works on Desktop.
First, Make sure the video is currently in playing mode.
After that, type the word 'awesome' on your keyboard.
Your YouTube progress bar will transform into a flashing rainbow.

Allow me to introduce myself briefly,
Howdy, my name's Delphi.
I can be of service in providing you with answers to your inquiries.
R : Cumulative sum of a column based on the values of another column (R)
If you have more specific query you can comment or chat with me and let me know your queries.
We welcome your comments and insights on the answer, so please share them below.
I will 'heart' your answer as a sign of appreciation.
another sum (R) a of of on R values column Cumulative column : based the