LAPACK 3.12.0
LAPACK: Linear Algebra PACKage
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dlahrd.f File Reference

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subroutine dlahrd (n, k, nb, a, lda, tau, t, ldt, y, ldy)
 DLAHRD reduces the first nb columns of a general rectangular matrix A so that elements below the k-th subdiagonal are zero, and returns auxiliary matrices which are needed to apply the transformation to the unreduced part of A.