st: A Loop for Making Matrixes and calculating Eigenvalues for each Observation

[Asgar Khademvatani <akhademv@ucalgary.ca>]

Dear Statalist,

I have already generated four variable A, B, C, and D each contains 43 
observation inn Stata V8.2. 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 calclate the real Eigenvalues of each matrix 
and list each of them. I need to wrire 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 V[`i']
 5. }
invalid syntax
r(198);

end of do-file
r(198);

May anybody in the list please help me out on this matter or say me how 
can I perform this job more efficiently?

Thanks in advance

Asgar Khademvatani
University of Calgary-Canada
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