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st: looping over a variable list of variables


From   Pradipto Banerjee <pradipto.banerjee@adainvestments.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: looping over a variable list of variables
Date   Fri, 23 Nov 2012 12:28:16 -0600

Hi,

Suppose I have a set of variables v1, v2, v3, ..., vn where each variable takes a value equal to 0, 1, 2. I want to write a program that can do the following:

1. If the program is supplied with v1, then it loops over v1 = 0, 1, 2 and does some operation for each value of v1 . Here I can achieve it with a single - forvalues - loop

2. If the program is supplied with v1 & v2, then it loops over v1 = 0,1,2 and v2=0,1,2 (i.e. a total of 9 loops), and does some operation for each combination of v1 & v2. Here I can achieve it with two nested -forvalues- loops

3. Similarly, if v1, v2, v3 are supplied, I can achieve it with three nested -forvalues- loops

The problem can get out of hand if v1, v2, v3, ..., vn is supplied to the program as I need to hard-code the nested loops structures up to a large value of n.

An alternative is to run one - forvalues - or -forvalues- loop with all permutations of v1, v2, v3,..., vn already determined in a local macro variable.

Is there way / function that can return all permutations of v1, v2, v3 ..., vn in a local macro variable(s) ?

Thanks


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