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---
:name: zungr2
:md5sum: 4a30cf54fa461d95f7ab0a1082f797c4
:category: :subroutine
:arguments:
- m:
:type: integer
:intent: input
- n:
:type: integer
:intent: input
- k:
:type: integer
:intent: input
- a:
:type: doublecomplex
:intent: input/output
:dims:
- lda
- n
- lda:
:type: integer
:intent: input
- tau:
:type: doublecomplex
:intent: input
:dims:
- k
- work:
:type: doublecomplex
:intent: workspace
:dims:
- m
- info:
:type: integer
:intent: output
:substitutions:
m: lda
:fortran_help: " SUBROUTINE ZUNGR2( M, N, K, A, LDA, TAU, WORK, INFO )\n\n\
* Purpose\n\
* =======\n\
*\n\
* ZUNGR2 generates an m by n complex matrix Q with orthonormal rows,\n\
* which is defined as the last m rows of a product of k elementary\n\
* reflectors of order n\n\
*\n\
* Q = H(1)' H(2)' . . . H(k)'\n\
*\n\
* as returned by ZGERQF.\n\
*\n\n\
* Arguments\n\
* =========\n\
*\n\
* M (input) INTEGER\n\
* The number of rows of the matrix Q. M >= 0.\n\
*\n\
* N (input) INTEGER\n\
* The number of columns of the matrix Q. N >= M.\n\
*\n\
* K (input) INTEGER\n\
* The number of elementary reflectors whose product defines the\n\
* matrix Q. M >= K >= 0.\n\
*\n\
* A (input/output) COMPLEX*16 array, dimension (LDA,N)\n\
* On entry, the (m-k+i)-th row must contain the vector which\n\
* defines the elementary reflector H(i), for i = 1,2,...,k, as\n\
* returned by ZGERQF in the last k rows of its array argument\n\
* A.\n\
* On exit, the m-by-n matrix Q.\n\
*\n\
* LDA (input) INTEGER\n\
* The first dimension of the array A. LDA >= max(1,M).\n\
*\n\
* TAU (input) COMPLEX*16 array, dimension (K)\n\
* TAU(i) must contain the scalar factor of the elementary\n\
* reflector H(i), as returned by ZGERQF.\n\
*\n\
* WORK (workspace) COMPLEX*16 array, dimension (M)\n\
*\n\
* INFO (output) INTEGER\n\
* = 0: successful exit\n\
* < 0: if INFO = -i, the i-th argument has an illegal value\n\
*\n\n\
* =====================================================================\n\
*\n"
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