Basic loop programming

Hi
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Paolo Donatelli
Sent: Wednesday, January 09, 2013 5:03 PM
To: r-help at r-project.org
Subject: [R] Basic loop programming

Hi all,

newbie question: I am trying to set up a very simple loop without
succeeding.

Let's say I have monthly observation of two variables for a year
- Sales_2012_01, Sales_2012_02, Sales_2012_03, ....      (total sales
for jan 2012,feb 2012, etc.)
- Customers_2012_01, Customers_2012_02, ....  (total number of
customers for jan 2012, etc.)

and I want to create new monthly variables in order to compute revenues
per customers:

Av_revenue_2012_01 = Sales_2012_01 / Customers_2012_01
Av_revenue_2012_02 = Sales_2012_02 / Customers_2012_02 ...

how can I proceed?

In other programming language I used just to write something like for
(i in list("01","02, ..., "12") { Av_revenue_2012_'i' = Sales_2012_'i'
/ Customers_2012_'i'
}

but in R it seems not to work like that. Further, and correct me if I
am wrong, I cannot use simple (i in 1:12) since I have a 0 digit in
front of the single-digit months.
Hm. Why do you want to do it in R if you prefer other languages? Did you find R by accident or are you prepared to use it in future? If you want to use it, it is just right time to learn some basics.

Anyway, if you have 2 vectors, call them sales and customers, you can just do

av.revenue <- sales/customers

Until you do not provide more info about your data e.g. by at least some of

?head, ?str or preferably ?dput

you hardly get some suitable advice.

Regards
Petr
thanks in advance for your help

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Basic loop programming

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