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From |
Asgar Khademvatani <[email protected]> |

To |
[email protected] |

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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