-----Original Message-----
From: asltjoey.rsoft at gmail.com
Sent: Sun, 17 Feb 2013 20:10:13 +0700
To: r-help at r-project.org
Subject: [R] How to do a backward calculation for each record in a
dataset
Hi Experts,
I have a dataset of 3 columns:
customer.name product cost
John Toothpaste 30
Mike Toothpaste 45
Peter Toothpaste 40
And I have a function of cost whereby
cost = 3.40 + (1.20 * no.of.orders^2)
I want to do a backward calculation for each records (each customer) to
find his no.of.orders and create a new column named "no.of.orders" in
that
dataset but I don't know how to do.
Please help me.
Thank you everyone,
Prakasit
[[alternative HTML version deleted]]