1c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath SUBROUTINE DSPR2(UPLO,N,ALPHA,X,INCX,Y,INCY,AP) 2c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. Scalar Arguments .. 3c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DOUBLE PRECISION ALPHA 4c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INTEGER INCX,INCY,N 5c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath CHARACTER UPLO 6c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 7c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. Array Arguments .. 8c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DOUBLE PRECISION AP(*),X(*),Y(*) 9c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 10c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 11c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Purpose 12c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ======= 13c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 14c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* DSPR2 performs the symmetric rank 2 operation 15c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 16c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* A := alpha*x*y' + alpha*y*x' + A, 17c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 18c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* where alpha is a scalar, x and y are n element vectors and A is an 19c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* n by n symmetric matrix, supplied in packed form. 20c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 21c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Arguments 22c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ========== 23c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 24c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* UPLO - CHARACTER*1. 25c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* On entry, UPLO specifies whether the upper or lower 26c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* triangular part of the matrix A is supplied in the packed 27c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* array AP as follows: 28c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 29c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* UPLO = 'U' or 'u' The upper triangular part of A is 30c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* supplied in AP. 31c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 32c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* UPLO = 'L' or 'l' The lower triangular part of A is 33c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* supplied in AP. 34c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 35c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 36c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 37c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* N - INTEGER. 38c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* On entry, N specifies the order of the matrix A. 39c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* N must be at least zero. 40c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 41c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 42c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ALPHA - DOUBLE PRECISION. 43c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* On entry, ALPHA specifies the scalar alpha. 44c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 45c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 46c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* X - DOUBLE PRECISION array of dimension at least 47c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ( 1 + ( n - 1 )*abs( INCX ) ). 48c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Before entry, the incremented array X must contain the n 49c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* element vector x. 50c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 51c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 52c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* INCX - INTEGER. 53c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* On entry, INCX specifies the increment for the elements of 54c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* X. INCX must not be zero. 55c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 56c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 57c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Y - DOUBLE PRECISION array of dimension at least 58c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ( 1 + ( n - 1 )*abs( INCY ) ). 59c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Before entry, the incremented array Y must contain the n 60c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* element vector y. 61c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 62c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 63c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* INCY - INTEGER. 64c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* On entry, INCY specifies the increment for the elements of 65c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Y. INCY must not be zero. 66c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Unchanged on exit. 67c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 68c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* AP - DOUBLE PRECISION array of DIMENSION at least 69c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ( ( n*( n + 1 ) )/2 ). 70c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Before entry with UPLO = 'U' or 'u', the array AP must 71c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* contain the upper triangular part of the symmetric matrix 72c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* packed sequentially, column by column, so that AP( 1 ) 73c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 1, 2 ) 74c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* and a( 2, 2 ) respectively, and so on. On exit, the array 75c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* AP is overwritten by the upper triangular part of the 76c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* updated matrix. 77c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Before entry with UPLO = 'L' or 'l', the array AP must 78c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* contain the lower triangular part of the symmetric matrix 79c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* packed sequentially, column by column, so that AP( 1 ) 80c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* contains a( 1, 1 ), AP( 2 ) and AP( 3 ) contain a( 2, 1 ) 81c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* and a( 3, 1 ) respectively, and so on. On exit, the array 82c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* AP is overwritten by the lower triangular part of the 83c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* updated matrix. 84c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 85c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Further Details 86c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* =============== 87c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 88c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Level 2 Blas routine. 89c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 90c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* -- Written on 22-October-1986. 91c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Jack Dongarra, Argonne National Lab. 92c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Jeremy Du Croz, Nag Central Office. 93c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Sven Hammarling, Nag Central Office. 94c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Richard Hanson, Sandia National Labs. 95c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 96c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* ===================================================================== 97c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 98c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. Parameters .. 99c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DOUBLE PRECISION ZERO 100c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath PARAMETER (ZERO=0.0D+0) 101c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 102c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. Local Scalars .. 103c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DOUBLE PRECISION TEMP1,TEMP2 104c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INTEGER I,INFO,IX,IY,J,JX,JY,K,KK,KX,KY 105c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 106c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. External Functions .. 107c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath LOGICAL LSAME 108c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath EXTERNAL LSAME 109c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 110c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. External Subroutines .. 111c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath EXTERNAL XERBLA 112c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* .. 113c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 114c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Test the input parameters. 115c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 116c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INFO = 0 117c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF (.NOT.LSAME(UPLO,'U') .AND. .NOT.LSAME(UPLO,'L')) THEN 118c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INFO = 1 119c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE IF (N.LT.0) THEN 120c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INFO = 2 121c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE IF (INCX.EQ.0) THEN 122c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INFO = 5 123c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE IF (INCY.EQ.0) THEN 124c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath INFO = 7 125c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 126c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF (INFO.NE.0) THEN 127c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath CALL XERBLA('DSPR2 ',INFO) 128c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath RETURN 129c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 130c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 131c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Quick return if possible. 132c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 133c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((N.EQ.0) .OR. (ALPHA.EQ.ZERO)) RETURN 134c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 135c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Set up the start points in X and Y if the increments are not both 136c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* unity. 137c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 138c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((INCX.NE.1) .OR. (INCY.NE.1)) THEN 139c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF (INCX.GT.0) THEN 140c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KX = 1 141c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE 142c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KX = 1 - (N-1)*INCX 143c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 144c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF (INCY.GT.0) THEN 145c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KY = 1 146c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE 147c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KY = 1 - (N-1)*INCY 148c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 149c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JX = KX 150c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JY = KY 151c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 152c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 153c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Start the operations. In this version the elements of the array AP 154c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* are accessed sequentially with one pass through AP. 155c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 156c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KK = 1 157c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF (LSAME(UPLO,'U')) THEN 158c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 159c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Form A when upper triangle is stored in AP. 160c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 161c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((INCX.EQ.1) .AND. (INCY.EQ.1)) THEN 162c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 20 J = 1,N 163c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((X(J).NE.ZERO) .OR. (Y(J).NE.ZERO)) THEN 164c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP1 = ALPHA*Y(J) 165c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP2 = ALPHA*X(J) 166c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath K = KK 167c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 10 I = 1,J 168c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath AP(K) = AP(K) + X(I)*TEMP1 + Y(I)*TEMP2 169c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath K = K + 1 170c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 10 CONTINUE 171c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 172c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KK = KK + J 173c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 20 CONTINUE 174c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE 175c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 40 J = 1,N 176c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((X(JX).NE.ZERO) .OR. (Y(JY).NE.ZERO)) THEN 177c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP1 = ALPHA*Y(JY) 178c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP2 = ALPHA*X(JX) 179c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IX = KX 180c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IY = KY 181c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 30 K = KK,KK + J - 1 182c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath AP(K) = AP(K) + X(IX)*TEMP1 + Y(IY)*TEMP2 183c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IX = IX + INCX 184c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IY = IY + INCY 185c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 30 CONTINUE 186c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 187c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JX = JX + INCX 188c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JY = JY + INCY 189c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KK = KK + J 190c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 40 CONTINUE 191c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 192c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE 193c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 194c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* Form A when lower triangle is stored in AP. 195c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 196c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((INCX.EQ.1) .AND. (INCY.EQ.1)) THEN 197c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 60 J = 1,N 198c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((X(J).NE.ZERO) .OR. (Y(J).NE.ZERO)) THEN 199c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP1 = ALPHA*Y(J) 200c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP2 = ALPHA*X(J) 201c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath K = KK 202c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 50 I = J,N 203c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath AP(K) = AP(K) + X(I)*TEMP1 + Y(I)*TEMP2 204c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath K = K + 1 205c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 50 CONTINUE 206c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 207c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KK = KK + N - J + 1 208c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 60 CONTINUE 209c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath ELSE 210c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 80 J = 1,N 211c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IF ((X(JX).NE.ZERO) .OR. (Y(JY).NE.ZERO)) THEN 212c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP1 = ALPHA*Y(JY) 213c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath TEMP2 = ALPHA*X(JX) 214c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IX = JX 215c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IY = JY 216c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath DO 70 K = KK,KK + N - J 217c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath AP(K) = AP(K) + X(IX)*TEMP1 + Y(IY)*TEMP2 218c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IX = IX + INCX 219c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath IY = IY + INCY 220c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 70 CONTINUE 221c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 222c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JX = JX + INCX 223c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath JY = JY + INCY 224c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath KK = KK + N - J + 1 225c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath 80 CONTINUE 226c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 227c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END IF 228c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 229c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath RETURN 230c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 231c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* End of DSPR2 . 232c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath* 233c981c48f5bc9aefeffc0bcb0cc3934c2fae179ddNarayan Kamath END 234