st: looping over a variable list of variables

[Pradipto Banerjee <pradipto.banerjee@adainvestments.com>]

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


 This communication is for informational purposes only. It is not intended to be, nor should it be construed or used as, financial, legal, tax or investment advice or an offer to sell, or a solicitation of any offer to buy, an interest in any fund advised by Ada Investment Management LP, the Investment advisor.  Any offer or solicitation of an investment in any of the Funds may be made only by delivery of such Funds confidential offering materials to authorized prospective investors.  An investment in any of the Funds is not suitable for all investors.  No representation is made that the Funds will or are likely to achieve their objectives, or that any investor will or is likely to achieve results comparable to those shown, or will make any profit at all or will be able to avoid incurring substantial losses.  Performance results are net of applicable fees, are unaudited and reflect reinvestment of income and profits.  Past performance is no guarantee of future results. All f!
 inancial data and other information are not warranted as to completeness or accuracy and are subject to change without notice.

Any comments or statements made herein do not necessarily reflect those of Ada Investment Management LP and its affiliates. This transmission may contain information that is confidential, legally privileged, and/or exempt from disclosure under applicable law. If you are not the intended recipient, you are hereby notified that any disclosure, copying, distribution, or use of the information contained herein (including any reliance thereon) is strictly prohibited. If you received this transmission in error, please immediately contact the sender and destroy the material in its entirety, whether in electronic or hard copy format.

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/