How to append the random no.s for different variables in the same data.frame

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Vincy Pyne
Sent: Wednesday, September 12, 2012 9:36 AM
To: R. Michael Weylandt
Cc: r-help at r-project.org
Subject: Re: [R] How to append the random no.s for different variables
in the same data.frame

Dear Mr Weylandt and R helpers,

Thanks a lot for your suggestion. Unfortunately the "return" statement
in my original R code returns me different results which are obtained
after processing the function I have constructed.

My requirement for storing the product-wise random numbers is just a
part of my whole exercise. For each of the products, I generate a set
of random no.s, process these, construct some statistics and obtain
these statistics using the "Return" statement. So for each of the
products, I get these set of statistics generated and that is not my
problem.

My problem is "BESIDES getting my required output (which anyways I am
getting)", I need the product-wise random numbers I have already
generated and store them together in a single data.frame. So a single
data.frame gives me all the product wise random nos.

I am reproducing my problem once again -

# ____________________________________


library(plyr)
n = 100

my_code = function(product, output_avg, output_stdev)

??? {

BUR_mc = rnorm(n, output_avg, output_stdev)

sim_BUR = data.frame(product, BUR_mc)

write.csv(data.frame(sim_BUR), 'sim_BUR.csv', row.names = FALSE)

return(list(output_avg, output_stdev))

??? }


result <- dlply(.data = My_data, .variables = "product", .fun =
function(x)

 my_code(product = x$product, output_avg = x$output_avg,
???????????????? output_stdev = x$output_stdev))


There
 are some 12 products (and this may vary each time). In my original
code, the "return" statement returns me some other output. Here for
simplicity sake, I am just using the values as given in input.


PROBLEM

I
 want to store the random no.s (BUR_mc) as generated above for each of
the products and store them in a single data.frame. Now when I access
'sim_BUR.csv', I get the csv file where the random nos. generated for
the last product are getting stored. I need something like

product????????? random no
product1???????? .......
product1
 .......
.............................

product1???????? .......????????????????? # (There will be 100 such
values for product1)
product2???????? .......
product2???????? .......

............................
............................
product12?????? ......
............................
product12?????? .......


Thanking you in advance

Vincy


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