LAPACK Archives

### [Lapack] Regarding functions and results from CLAPACK

 Hello, I am Koushik Aravalli from Clemson University. I am using CLAPACK for my research and trying to decode the resultant matrices formed from the subroutines dgeqr2.c, dgetrf.c. For example the final matrix formed out from the dgetrf subroutine is a combination of a matrix produced from a scalar and a vector. The below message is from the subroutine mentioned. FROM CLAPACK dgetrf subroutine. Further Details =============== The matrix Q is represented as a product of elementary reflectors Q = H(1) H(2) . . . H(k), where k = min(m,n). Each H(i) has the form H(i) = I - tau * v * v' where tau is a real scalar, and v is a real vector with v(1:i-1) = 0 and v(i) = 1; v(i+1:m) is stored on exit in A(i+1:m,i), and tau in TAU(i). ============= So if I solve for a linear equation set using QR decomposition, the final matrix obtained is a product of reflectors. Comparing with the MATLAB results I am not able to figure out a way to decode the matrix obtained from "dgetrf" subroutine. By the way I am using MS Visual studio to do these matrix computations. Can you please help me out in obtaining the decoded matrix results. Thank you, Koushik Aravalli -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.cs.utk.edu/private/lapack/attachments/20060828/e2c37b44/attachment.htm
 Current Thread [Lapack] Regarding functions and results from CLAPACK, koushik <= [Lapack] Regarding functions and results from CLAPACK, Sven Hammarling

For additional information you may use the LAPACK/ScaLAPACK Forum.
Or one of the mailing lists, or