# zlahr2.f - Man Page

## Synopsis

### Functions/Subroutines

subroutine **zlahr2** (**N**, K, NB, A, **LDA**, TAU, T, LDT, Y, LDY)**ZLAHR2** reduces the specified number of first columns of a general rectangular matrix A so that elements below the specified subdiagonal are zero, and returns auxiliary matrices which are needed to apply the transformation to the unreduced part of A.

## Author

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## Info

Thu Apr 1 2021 Version 3.9.1 LAPACK