Conjugate Gradient Methods for Computing Weighted Analytic Center for Linear Matrix Inequalities Using Exact and Quadratic Interpolation Line Searches
American Journal of Applied Mathematics
Volume 8, Issue 1, February 2020, Pages: 1-10
Received: Oct. 18, 2019;
Accepted: Nov. 27, 2019;
Published: Jan. 4, 2020
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Shafiu Jibrin, Department of Mathematics, Faculty of Science, Federal University, Dutse, Jigawa State, Nigeria
Ibrahim Abdullahi, Department of Mathematics, Faculty of Science, Federal University, Dutse, Jigawa State, Nigeria
We study the problem of computing the weighted analytic center for linear matrix inequality constraints. In this paper, we apply conjugate gradient (CG) methods to find the weighted analytic center. CG methods have low memory requirements and strong local and global convergence properties. The methods considered are the classical methods by Hestenes-Stiefel (HS), Fletcher and Reeves (FR), Polak and Ribiere (PR) and a relatively new method by Rivaie, Abashar, Mustafa and Ismail (RAMI). We compare performance of each method on random test problems by observing the number of iterations and time required by the method to find the weighted analytic center for each test problem. We use Newton’s method exact line search and Quadratic Interpolation inexact line search. Our numerical results show that PR is the best method, followed by HS, then RAMI, and then FR. However, PR and HS performed about the same with exact line search. The results also indicate that both line searches work well, but exact line search handles weights better than the inexact line search when some weight is relatively much larger than the other weights. We also find from our results that with Quadratic interpolation line search, FR is more susceptible to jamming phenomenon than both PR and HS.
Conjugate Gradient Methods for Computing Weighted Analytic Center for Linear Matrix Inequalities Using Exact and Quadratic Interpolation Line Searches, American Journal of Applied Mathematics.
Vol. 8, No. 1,
2020, pp. 1-10.
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