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st: A Question on Looping


From   Asgar Khademvatani <akhademv@ucalgary.ca>
To   statalist@hsphsun2.harvard.edu
Subject   st: A Question on Looping
Date   Tue, 18 Sep 2007 07:13:03 -0600

Dear Statalist

Actually, I have already generated four variable A, B, C, and D that each contains 43 observation, in Stata 8.2. I want to make 43 square matrix (2 by 2) using each of 43 observation based on each observation of these variables. Then, I want to calculate the real Eigenvalues of each matrix and list the 43 matrix and their Eigenvalues. I need to write a loop to do this job. Actually, I have already written the following loop using "foreach command" but I am getting the following error as follows;

foreach i = 1/43 {
2. matrix K[`i'] = (A[`i'], B[`i'] \ C[`i'],D[`i'])
3. matrix symeigen X[`i'] V[`i'] = K[`i']
4. matrix list K[`i'] V[`i']
5. }
invalid syntax
r(198);

end of do-file
r(198);


Also, alternativley, I have written another alternative do file by "while" loop but it is also subject to error as follows;

1.local i 1
2. while `i' < 43 {
3. matrix K[`i'] = (lpl_m[`i'], lpm_m[`i'] \ le_m[`i'],lk_m[`i'])
4. matrix symeigen X[`i'] V[`i'] = K[`i']
5. matrix list V[`i']
6. local i = `i' + 1
7. }
too many ')' or ']'
r(132);

end of do-file
r(132);


Could you help me out on this matter and say what is wrong with any of these alternative loops?

Thanks
Asgar Khademvatani
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