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AN ITERATIVE METHOD FOR ORTHOGONAL PROJECTIONS OF GENERALIZED INVERSES
AN ITERATIVE METHOD FOR ORTHOGONAL PROJECTIONS OF GENERALIZED INVERSES
Journal of applied mathematics & informatics. 2014. Jan, 32(1_2): 61-74
  • Received : December 01, 2012
  • Published : January 30, 2014
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Srivastava Shwetabh
Gupta D.K.

Abstract
This paper describes an iterative method for orthogonal projections <TEX>$AA^+$</TEX> and <TEX>$A^+A$</TEX> of an arbitrary matrix A, where <TEX>$A^+$</TEX> represents the Moore-Penrose inverse. Convergence analysis along with the first and second order error estimates of the method are investigated. Three numerical examples are worked out to show the efficacy of our work. The first example is on a full rank matrix, whereas the other two are on full rank and rank deficient randomly generated matrices. The results obtained by the method are compared with those obtained by another iterative method. The performance measures in terms of mean CPU time (MCT) and the error bounds for computing orthogonal projections are listed in tables. If <TEX>$Z_k$</TEX>, k
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