[R] How to do a backward calculation for each record in a dataset

[John Kane]

This sounds a bit too much like homework.  

And in any case https://github.com/hadley/devtools/wiki/Reproducibility

John Kane
Kingston ON Canada


> -----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]]
> 
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