Annotation of rpl/lapack/lapack/zlaset.f, revision 1.8
1.8 ! bertrand 1: *> \brief \b ZLASET
! 2: *
! 3: * =========== DOCUMENTATION ===========
! 4: *
! 5: * Online html documentation available at
! 6: * http://www.netlib.org/lapack/explore-html/
! 7: *
! 8: *> \htmlonly
! 9: *> Download ZLASET + dependencies
! 10: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.tgz?format=tgz&filename=/lapack/lapack_routine/zlaset.f">
! 11: *> [TGZ]</a>
! 12: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.zip?format=zip&filename=/lapack/lapack_routine/zlaset.f">
! 13: *> [ZIP]</a>
! 14: *> <a href="http://www.netlib.org/cgi-bin/netlibfiles.txt?format=txt&filename=/lapack/lapack_routine/zlaset.f">
! 15: *> [TXT]</a>
! 16: *> \endhtmlonly
! 17: *
! 18: * Definition:
! 19: * ===========
! 20: *
! 21: * SUBROUTINE ZLASET( UPLO, M, N, ALPHA, BETA, A, LDA )
! 22: *
! 23: * .. Scalar Arguments ..
! 24: * CHARACTER UPLO
! 25: * INTEGER LDA, M, N
! 26: * COMPLEX*16 ALPHA, BETA
! 27: * ..
! 28: * .. Array Arguments ..
! 29: * COMPLEX*16 A( LDA, * )
! 30: * ..
! 31: *
! 32: *
! 33: *> \par Purpose:
! 34: * =============
! 35: *>
! 36: *> \verbatim
! 37: *>
! 38: *> ZLASET initializes a 2-D array A to BETA on the diagonal and
! 39: *> ALPHA on the offdiagonals.
! 40: *> \endverbatim
! 41: *
! 42: * Arguments:
! 43: * ==========
! 44: *
! 45: *> \param[in] UPLO
! 46: *> \verbatim
! 47: *> UPLO is CHARACTER*1
! 48: *> Specifies the part of the matrix A to be set.
! 49: *> = 'U': Upper triangular part is set. The lower triangle
! 50: *> is unchanged.
! 51: *> = 'L': Lower triangular part is set. The upper triangle
! 52: *> is unchanged.
! 53: *> Otherwise: All of the matrix A is set.
! 54: *> \endverbatim
! 55: *>
! 56: *> \param[in] M
! 57: *> \verbatim
! 58: *> M is INTEGER
! 59: *> On entry, M specifies the number of rows of A.
! 60: *> \endverbatim
! 61: *>
! 62: *> \param[in] N
! 63: *> \verbatim
! 64: *> N is INTEGER
! 65: *> On entry, N specifies the number of columns of A.
! 66: *> \endverbatim
! 67: *>
! 68: *> \param[in] ALPHA
! 69: *> \verbatim
! 70: *> ALPHA is COMPLEX*16
! 71: *> All the offdiagonal array elements are set to ALPHA.
! 72: *> \endverbatim
! 73: *>
! 74: *> \param[in] BETA
! 75: *> \verbatim
! 76: *> BETA is COMPLEX*16
! 77: *> All the diagonal array elements are set to BETA.
! 78: *> \endverbatim
! 79: *>
! 80: *> \param[in,out] A
! 81: *> \verbatim
! 82: *> A is COMPLEX*16 array, dimension (LDA,N)
! 83: *> On entry, the m by n matrix A.
! 84: *> On exit, A(i,j) = ALPHA, 1 <= i <= m, 1 <= j <= n, i.ne.j;
! 85: *> A(i,i) = BETA , 1 <= i <= min(m,n)
! 86: *> \endverbatim
! 87: *>
! 88: *> \param[in] LDA
! 89: *> \verbatim
! 90: *> LDA is INTEGER
! 91: *> The leading dimension of the array A. LDA >= max(1,M).
! 92: *> \endverbatim
! 93: *
! 94: * Authors:
! 95: * ========
! 96: *
! 97: *> \author Univ. of Tennessee
! 98: *> \author Univ. of California Berkeley
! 99: *> \author Univ. of Colorado Denver
! 100: *> \author NAG Ltd.
! 101: *
! 102: *> \date November 2011
! 103: *
! 104: *> \ingroup complex16OTHERauxiliary
! 105: *
! 106: * =====================================================================
1.1 bertrand 107: SUBROUTINE ZLASET( UPLO, M, N, ALPHA, BETA, A, LDA )
108: *
1.8 ! bertrand 109: * -- LAPACK auxiliary routine (version 3.4.0) --
1.1 bertrand 110: * -- LAPACK is a software package provided by Univ. of Tennessee, --
111: * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
1.8 ! bertrand 112: * November 2011
1.1 bertrand 113: *
114: * .. Scalar Arguments ..
115: CHARACTER UPLO
116: INTEGER LDA, M, N
117: COMPLEX*16 ALPHA, BETA
118: * ..
119: * .. Array Arguments ..
120: COMPLEX*16 A( LDA, * )
121: * ..
122: *
123: * =====================================================================
124: *
125: * .. Local Scalars ..
126: INTEGER I, J
127: * ..
128: * .. External Functions ..
129: LOGICAL LSAME
130: EXTERNAL LSAME
131: * ..
132: * .. Intrinsic Functions ..
133: INTRINSIC MIN
134: * ..
135: * .. Executable Statements ..
136: *
137: IF( LSAME( UPLO, 'U' ) ) THEN
138: *
139: * Set the diagonal to BETA and the strictly upper triangular
140: * part of the array to ALPHA.
141: *
142: DO 20 J = 2, N
143: DO 10 I = 1, MIN( J-1, M )
144: A( I, J ) = ALPHA
145: 10 CONTINUE
146: 20 CONTINUE
147: DO 30 I = 1, MIN( N, M )
148: A( I, I ) = BETA
149: 30 CONTINUE
150: *
151: ELSE IF( LSAME( UPLO, 'L' ) ) THEN
152: *
153: * Set the diagonal to BETA and the strictly lower triangular
154: * part of the array to ALPHA.
155: *
156: DO 50 J = 1, MIN( M, N )
157: DO 40 I = J + 1, M
158: A( I, J ) = ALPHA
159: 40 CONTINUE
160: 50 CONTINUE
161: DO 60 I = 1, MIN( N, M )
162: A( I, I ) = BETA
163: 60 CONTINUE
164: *
165: ELSE
166: *
167: * Set the array to BETA on the diagonal and ALPHA on the
168: * offdiagonal.
169: *
170: DO 80 J = 1, N
171: DO 70 I = 1, M
172: A( I, J ) = ALPHA
173: 70 CONTINUE
174: 80 CONTINUE
175: DO 90 I = 1, MIN( M, N )
176: A( I, I ) = BETA
177: 90 CONTINUE
178: END IF
179: *
180: RETURN
181: *
182: * End of ZLASET
183: *
184: END
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