root / src / lapack / double / dlaset.f @ 1
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| 1 | 1 | equemene | SUBROUTINE DLASET( UPLO, M, N, ALPHA, BETA, A, LDA ) |
|---|---|---|---|
| 2 | 1 | equemene | * |
| 3 | 1 | equemene | * -- LAPACK auxiliary routine (version 3.2) -- |
| 4 | 1 | equemene | * -- LAPACK is a software package provided by Univ. of Tennessee, -- |
| 5 | 1 | equemene | * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- |
| 6 | 1 | equemene | * November 2006 |
| 7 | 1 | equemene | * |
| 8 | 1 | equemene | * .. Scalar Arguments .. |
| 9 | 1 | equemene | CHARACTER UPLO |
| 10 | 1 | equemene | INTEGER LDA, M, N |
| 11 | 1 | equemene | DOUBLE PRECISION ALPHA, BETA |
| 12 | 1 | equemene | * .. |
| 13 | 1 | equemene | * .. Array Arguments .. |
| 14 | 1 | equemene | DOUBLE PRECISION A( LDA, * ) |
| 15 | 1 | equemene | * .. |
| 16 | 1 | equemene | * |
| 17 | 1 | equemene | * Purpose |
| 18 | 1 | equemene | * ======= |
| 19 | 1 | equemene | * |
| 20 | 1 | equemene | * DLASET initializes an m-by-n matrix A to BETA on the diagonal and |
| 21 | 1 | equemene | * ALPHA on the offdiagonals. |
| 22 | 1 | equemene | * |
| 23 | 1 | equemene | * Arguments |
| 24 | 1 | equemene | * ========= |
| 25 | 1 | equemene | * |
| 26 | 1 | equemene | * UPLO (input) CHARACTER*1 |
| 27 | 1 | equemene | * Specifies the part of the matrix A to be set. |
| 28 | 1 | equemene | * = 'U': Upper triangular part is set; the strictly lower |
| 29 | 1 | equemene | * triangular part of A is not changed. |
| 30 | 1 | equemene | * = 'L': Lower triangular part is set; the strictly upper |
| 31 | 1 | equemene | * triangular part of A is not changed. |
| 32 | 1 | equemene | * Otherwise: All of the matrix A is set. |
| 33 | 1 | equemene | * |
| 34 | 1 | equemene | * M (input) INTEGER |
| 35 | 1 | equemene | * The number of rows of the matrix A. M >= 0. |
| 36 | 1 | equemene | * |
| 37 | 1 | equemene | * N (input) INTEGER |
| 38 | 1 | equemene | * The number of columns of the matrix A. N >= 0. |
| 39 | 1 | equemene | * |
| 40 | 1 | equemene | * ALPHA (input) DOUBLE PRECISION |
| 41 | 1 | equemene | * The constant to which the offdiagonal elements are to be set. |
| 42 | 1 | equemene | * |
| 43 | 1 | equemene | * BETA (input) DOUBLE PRECISION |
| 44 | 1 | equemene | * The constant to which the diagonal elements are to be set. |
| 45 | 1 | equemene | * |
| 46 | 1 | equemene | * A (input/output) DOUBLE PRECISION array, dimension (LDA,N) |
| 47 | 1 | equemene | * On exit, the leading m-by-n submatrix of A is set as follows: |
| 48 | 1 | equemene | * |
| 49 | 1 | equemene | * if UPLO = 'U', A(i,j) = ALPHA, 1<=i<=j-1, 1<=j<=n, |
| 50 | 1 | equemene | * if UPLO = 'L', A(i,j) = ALPHA, j+1<=i<=m, 1<=j<=n, |
| 51 | 1 | equemene | * otherwise, A(i,j) = ALPHA, 1<=i<=m, 1<=j<=n, i.ne.j, |
| 52 | 1 | equemene | * |
| 53 | 1 | equemene | * and, for all UPLO, A(i,i) = BETA, 1<=i<=min(m,n). |
| 54 | 1 | equemene | * |
| 55 | 1 | equemene | * LDA (input) INTEGER |
| 56 | 1 | equemene | * The leading dimension of the array A. LDA >= max(1,M). |
| 57 | 1 | equemene | * |
| 58 | 1 | equemene | * ===================================================================== |
| 59 | 1 | equemene | * |
| 60 | 1 | equemene | * .. Local Scalars .. |
| 61 | 1 | equemene | INTEGER I, J |
| 62 | 1 | equemene | * .. |
| 63 | 1 | equemene | * .. External Functions .. |
| 64 | 1 | equemene | LOGICAL LSAME |
| 65 | 1 | equemene | EXTERNAL LSAME |
| 66 | 1 | equemene | * .. |
| 67 | 1 | equemene | * .. Intrinsic Functions .. |
| 68 | 1 | equemene | INTRINSIC MIN |
| 69 | 1 | equemene | * .. |
| 70 | 1 | equemene | * .. Executable Statements .. |
| 71 | 1 | equemene | * |
| 72 | 1 | equemene | IF( LSAME( UPLO, 'U' ) ) THEN |
| 73 | 1 | equemene | * |
| 74 | 1 | equemene | * Set the strictly upper triangular or trapezoidal part of the |
| 75 | 1 | equemene | * array to ALPHA. |
| 76 | 1 | equemene | * |
| 77 | 1 | equemene | DO 20 J = 2, N |
| 78 | 1 | equemene | DO 10 I = 1, MIN( J-1, M ) |
| 79 | 1 | equemene | A( I, J ) = ALPHA |
| 80 | 1 | equemene | 10 CONTINUE |
| 81 | 1 | equemene | 20 CONTINUE |
| 82 | 1 | equemene | * |
| 83 | 1 | equemene | ELSE IF( LSAME( UPLO, 'L' ) ) THEN |
| 84 | 1 | equemene | * |
| 85 | 1 | equemene | * Set the strictly lower triangular or trapezoidal part of the |
| 86 | 1 | equemene | * array to ALPHA. |
| 87 | 1 | equemene | * |
| 88 | 1 | equemene | DO 40 J = 1, MIN( M, N ) |
| 89 | 1 | equemene | DO 30 I = J + 1, M |
| 90 | 1 | equemene | A( I, J ) = ALPHA |
| 91 | 1 | equemene | 30 CONTINUE |
| 92 | 1 | equemene | 40 CONTINUE |
| 93 | 1 | equemene | * |
| 94 | 1 | equemene | ELSE |
| 95 | 1 | equemene | * |
| 96 | 1 | equemene | * Set the leading m-by-n submatrix to ALPHA. |
| 97 | 1 | equemene | * |
| 98 | 1 | equemene | DO 60 J = 1, N |
| 99 | 1 | equemene | DO 50 I = 1, M |
| 100 | 1 | equemene | A( I, J ) = ALPHA |
| 101 | 1 | equemene | 50 CONTINUE |
| 102 | 1 | equemene | 60 CONTINUE |
| 103 | 1 | equemene | END IF |
| 104 | 1 | equemene | * |
| 105 | 1 | equemene | * Set the first min(M,N) diagonal elements to BETA. |
| 106 | 1 | equemene | * |
| 107 | 1 | equemene | DO 70 I = 1, MIN( M, N ) |
| 108 | 1 | equemene | A( I, I ) = BETA |
| 109 | 1 | equemene | 70 CONTINUE |
| 110 | 1 | equemene | * |
| 111 | 1 | equemene | RETURN |
| 112 | 1 | equemene | * |
| 113 | 1 | equemene | * End of DLASET |
| 114 | 1 | equemene | * |
| 115 | 1 | equemene | END |