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/*  -- translated by f2c (version 19940927).
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   You must link the resulting object file with the libraries:
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	-lf2c -lm   (in that order)
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*/
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#include "f2c.h"
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/* Subroutine */ int chemv_(char *uplo, integer *n, complex *alpha, complex *
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	a, integer *lda, complex *x, integer *incx, complex *beta, complex *y,
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	 integer *incy)
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{
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    /* System generated locals */
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    integer a_dim1, a_offset, i__1, i__2, i__3, i__4, i__5;
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    doublereal d__1;
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    complex q__1, q__2, q__3, q__4;
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    /* Builtin functions */
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    void r_cnjg(complex *, complex *);
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    /* Local variables */
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    static integer info;
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    static complex temp1, temp2;
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    static integer i, j;
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    extern logical lsame_(char *, char *);
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    static integer ix, iy, jx, jy, kx, ky;
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    extern /* Subroutine */ int xerbla_(char *, integer *);
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/*  Purpose   
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    =======   
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    CHEMV  performs the matrix-vector  operation   
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       y := alpha*A*x + beta*y,   
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    where alpha and beta are scalars, x and y are n element vectors and   
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    A is an n by n hermitian matrix.   
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    Parameters   
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    ==========   
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    UPLO   - CHARACTER*1.   
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             On entry, UPLO specifies whether the upper or lower   
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             triangular part of the array A is to be referenced as   
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             follows:   
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                UPLO = 'U' or 'u'   Only the upper triangular part of A   
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                                    is to be referenced.   
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                UPLO = 'L' or 'l'   Only the lower triangular part of A   
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                                    is to be referenced.   
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             Unchanged on exit.   
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    N      - INTEGER.   
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             On entry, N specifies the order of the matrix A.   
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             N must be at least zero.   
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             Unchanged on exit.   
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    ALPHA  - COMPLEX         .   
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             On entry, ALPHA specifies the scalar alpha.   
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             Unchanged on exit.   
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    A      - COMPLEX          array of DIMENSION ( LDA, n ).   
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             Before entry with  UPLO = 'U' or 'u', the leading n by n   
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             upper triangular part of the array A must contain the upper 
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             triangular part of the hermitian matrix and the strictly   
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             lower triangular part of A is not referenced.   
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             Before entry with UPLO = 'L' or 'l', the leading n by n   
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             lower triangular part of the array A must contain the lower 
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             triangular part of the hermitian matrix and the strictly   
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             upper triangular part of A is not referenced.   
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             Note that the imaginary parts of the diagonal elements need 
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             not be set and are assumed to be zero.   
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             Unchanged on exit.   
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    LDA    - INTEGER.   
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             On entry, LDA specifies the first dimension of A as declared 
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             in the calling (sub) program. LDA must be at least   
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             max( 1, n ).   
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             Unchanged on exit.   
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    X      - COMPLEX          array of dimension at least   
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             ( 1 + ( n - 1 )*abs( INCX ) ).   
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             Before entry, the incremented array X must contain the n   
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             element vector x.   
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             Unchanged on exit.   
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    INCX   - INTEGER.   
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             On entry, INCX specifies the increment for the elements of   
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             X. INCX must not be zero.   
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             Unchanged on exit.   
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    BETA   - COMPLEX         .   
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             On entry, BETA specifies the scalar beta. When BETA is   
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             supplied as zero then Y need not be set on input.   
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             Unchanged on exit.   
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    Y      - COMPLEX          array of dimension at least   
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             ( 1 + ( n - 1 )*abs( INCY ) ).   
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             Before entry, the incremented array Y must contain the n   
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             element vector y. On exit, Y is overwritten by the updated   
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             vector y.   
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    INCY   - INTEGER.   
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             On entry, INCY specifies the increment for the elements of   
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             Y. INCY must not be zero.   
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             Unchanged on exit.   
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    Level 2 Blas routine.   
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    -- Written on 22-October-1986.   
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       Jack Dongarra, Argonne National Lab.   
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       Jeremy Du Croz, Nag Central Office.   
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       Sven Hammarling, Nag Central Office.   
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       Richard Hanson, Sandia National Labs.   
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       Test the input parameters.   
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   Parameter adjustments   
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       Function Body */
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#define X(I) x[(I)-1]
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#define Y(I) y[(I)-1]
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#define A(I,J) a[(I)-1 + ((J)-1)* ( *lda)]
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    info = 0;
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    if (! lsame_(uplo, "U") && ! lsame_(uplo, "L")) {
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	info = 1;
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    } else if (*n < 0) {
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	info = 2;
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    } else if (*lda < max(1,*n)) {
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	info = 5;
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    } else if (*incx == 0) {
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	info = 7;
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    } else if (*incy == 0) {
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	info = 10;
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    }
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    if (info != 0) {
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	xerbla_("CHEMV ", &info);
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	return 0;
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    }
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/*     Quick return if possible. */
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    if (*n == 0 || alpha->r == 0.f && alpha->i == 0.f && (beta->r == 1.f && 
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	    beta->i == 0.f)) {
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	return 0;
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    }
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/*     Set up the start points in  X  and  Y. */
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    if (*incx > 0) {
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	kx = 1;
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    } else {
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	kx = 1 - (*n - 1) * *incx;
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    }
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    if (*incy > 0) {
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	ky = 1;
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    } else {
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	ky = 1 - (*n - 1) * *incy;
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    }
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/*     Start the operations. In this version the elements of A are   
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       accessed sequentially with one pass through the triangular part   
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       of A.   
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       First form  y := beta*y. */
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    if (beta->r != 1.f || beta->i != 0.f) {
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	if (*incy == 1) {
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	    if (beta->r == 0.f && beta->i == 0.f) {
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		i__1 = *n;
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		for (i = 1; i <= *n; ++i) {
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		    i__2 = i;
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		    Y(i).r = 0.f, Y(i).i = 0.f;
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/* L10: */
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		}
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	    } else {
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		i__1 = *n;
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		for (i = 1; i <= *n; ++i) {
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		    i__2 = i;
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		    i__3 = i;
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		    q__1.r = beta->r * Y(i).r - beta->i * Y(i).i, 
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			    q__1.i = beta->r * Y(i).i + beta->i * Y(i)
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			    .r;
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		    Y(i).r = q__1.r, Y(i).i = q__1.i;
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/* L20: */
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		}
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	    }
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	} else {
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	    iy = ky;
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	    if (beta->r == 0.f && beta->i == 0.f) {
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		i__1 = *n;
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		for (i = 1; i <= *n; ++i) {
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		    i__2 = iy;
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		    Y(iy).r = 0.f, Y(iy).i = 0.f;
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		    iy += *incy;
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/* L30: */
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		}
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	    } else {
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		i__1 = *n;
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		for (i = 1; i <= *n; ++i) {
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		    i__2 = iy;
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		    i__3 = iy;
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		    q__1.r = beta->r * Y(iy).r - beta->i * Y(iy).i, 
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			    q__1.i = beta->r * Y(iy).i + beta->i * Y(iy)
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			    .r;
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		    Y(iy).r = q__1.r, Y(iy).i = q__1.i;
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		    iy += *incy;
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/* L40: */
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		}
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	    }
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	}
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    }
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    if (alpha->r == 0.f && alpha->i == 0.f) {
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	return 0;
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    }
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    if (lsame_(uplo, "U")) {
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/*        Form  y  when A is stored in upper triangle. */
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	if (*incx == 1 && *incy == 1) {
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	    i__1 = *n;
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	    for (j = 1; j <= *n; ++j) {
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		i__2 = j;
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		q__1.r = alpha->r * X(j).r - alpha->i * X(j).i, q__1.i =
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			 alpha->r * X(j).i + alpha->i * X(j).r;
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		temp1.r = q__1.r, temp1.i = q__1.i;
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		temp2.r = 0.f, temp2.i = 0.f;
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		i__2 = j - 1;
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		for (i = 1; i <= j-1; ++i) {
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		    i__3 = i;
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		    i__4 = i;
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		    i__5 = i + j * a_dim1;
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		    q__2.r = temp1.r * A(i,j).r - temp1.i * A(i,j).i, 
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			    q__2.i = temp1.r * A(i,j).i + temp1.i * A(i,j)
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			    .r;
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		    q__1.r = Y(i).r + q__2.r, q__1.i = Y(i).i + q__2.i;
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		    Y(i).r = q__1.r, Y(i).i = q__1.i;
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		    r_cnjg(&q__3, &A(i,j));
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		    i__3 = i;
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		    q__2.r = q__3.r * X(i).r - q__3.i * X(i).i, q__2.i =
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			     q__3.r * X(i).i + q__3.i * X(i).r;
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		    q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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		    temp2.r = q__1.r, temp2.i = q__1.i;
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/* L50: */
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		}
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		i__2 = j;
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		i__3 = j;
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		i__4 = j + j * a_dim1;
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		d__1 = A(j,j).r;
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		q__3.r = d__1 * temp1.r, q__3.i = d__1 * temp1.i;
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		q__2.r = Y(j).r + q__3.r, q__2.i = Y(j).i + q__3.i;
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		q__4.r = alpha->r * temp2.r - alpha->i * temp2.i, q__4.i = 
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			alpha->r * temp2.i + alpha->i * temp2.r;
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		q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
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		Y(j).r = q__1.r, Y(j).i = q__1.i;
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/* L60: */
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	    }
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	} else {
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	    jx = kx;
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	    jy = ky;
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	    i__1 = *n;
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	    for (j = 1; j <= *n; ++j) {
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		i__2 = jx;
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		q__1.r = alpha->r * X(jx).r - alpha->i * X(jx).i, q__1.i =
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			 alpha->r * X(jx).i + alpha->i * X(jx).r;
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		temp1.r = q__1.r, temp1.i = q__1.i;
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		temp2.r = 0.f, temp2.i = 0.f;
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		ix = kx;
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		iy = ky;
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		i__2 = j - 1;
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		for (i = 1; i <= j-1; ++i) {
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		    i__3 = iy;
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		    i__4 = iy;
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		    i__5 = i + j * a_dim1;
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		    q__2.r = temp1.r * A(i,j).r - temp1.i * A(i,j).i, 
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			    q__2.i = temp1.r * A(i,j).i + temp1.i * A(i,j)
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			    .r;
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		    q__1.r = Y(iy).r + q__2.r, q__1.i = Y(iy).i + q__2.i;
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		    Y(iy).r = q__1.r, Y(iy).i = q__1.i;
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		    r_cnjg(&q__3, &A(i,j));
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		    i__3 = ix;
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		    q__2.r = q__3.r * X(ix).r - q__3.i * X(ix).i, q__2.i =
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			     q__3.r * X(ix).i + q__3.i * X(ix).r;
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		    q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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		    temp2.r = q__1.r, temp2.i = q__1.i;
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		    ix += *incx;
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		    iy += *incy;
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/* L70: */
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		}
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		i__2 = jy;
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		i__3 = jy;
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		i__4 = j + j * a_dim1;
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		d__1 = A(j,j).r;
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		q__3.r = d__1 * temp1.r, q__3.i = d__1 * temp1.i;
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		q__2.r = Y(jy).r + q__3.r, q__2.i = Y(jy).i + q__3.i;
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		q__4.r = alpha->r * temp2.r - alpha->i * temp2.i, q__4.i = 
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			alpha->r * temp2.i + alpha->i * temp2.r;
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		q__1.r = q__2.r + q__4.r, q__1.i = q__2.i + q__4.i;
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		Y(jy).r = q__1.r, Y(jy).i = q__1.i;
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		jx += *incx;
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		jy += *incy;
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/* L80: */
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	    }
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	}
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    } else {
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/*        Form  y  when A is stored in lower triangle. */
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	if (*incx == 1 && *incy == 1) {
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	    i__1 = *n;
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	    for (j = 1; j <= *n; ++j) {
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		i__2 = j;
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		q__1.r = alpha->r * X(j).r - alpha->i * X(j).i, q__1.i =
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			 alpha->r * X(j).i + alpha->i * X(j).r;
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		temp1.r = q__1.r, temp1.i = q__1.i;
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		temp2.r = 0.f, temp2.i = 0.f;
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		i__2 = j;
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		i__3 = j;
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		i__4 = j + j * a_dim1;
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		d__1 = A(j,j).r;
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		q__2.r = d__1 * temp1.r, q__2.i = d__1 * temp1.i;
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		q__1.r = Y(j).r + q__2.r, q__1.i = Y(j).i + q__2.i;
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		Y(j).r = q__1.r, Y(j).i = q__1.i;
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		i__2 = *n;
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		for (i = j + 1; i <= *n; ++i) {
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		    i__3 = i;
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		    i__4 = i;
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		    i__5 = i + j * a_dim1;
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		    q__2.r = temp1.r * A(i,j).r - temp1.i * A(i,j).i, 
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			    q__2.i = temp1.r * A(i,j).i + temp1.i * A(i,j)
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			    .r;
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		    q__1.r = Y(i).r + q__2.r, q__1.i = Y(i).i + q__2.i;
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		    Y(i).r = q__1.r, Y(i).i = q__1.i;
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		    r_cnjg(&q__3, &A(i,j));
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		    i__3 = i;
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		    q__2.r = q__3.r * X(i).r - q__3.i * X(i).i, q__2.i =
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			     q__3.r * X(i).i + q__3.i * X(i).r;
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		    q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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		    temp2.r = q__1.r, temp2.i = q__1.i;
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/* L90: */
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		}
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		i__2 = j;
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		i__3 = j;
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		q__2.r = alpha->r * temp2.r - alpha->i * temp2.i, q__2.i = 
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			alpha->r * temp2.i + alpha->i * temp2.r;
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		q__1.r = Y(j).r + q__2.r, q__1.i = Y(j).i + q__2.i;
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		Y(j).r = q__1.r, Y(j).i = q__1.i;
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/* L100: */
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	    }
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	} else {
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	    jx = kx;
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	    jy = ky;
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	    i__1 = *n;
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	    for (j = 1; j <= *n; ++j) {
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		i__2 = jx;
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		q__1.r = alpha->r * X(jx).r - alpha->i * X(jx).i, q__1.i =
kusano 7d535a
			 alpha->r * X(jx).i + alpha->i * X(jx).r;
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		temp1.r = q__1.r, temp1.i = q__1.i;
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		temp2.r = 0.f, temp2.i = 0.f;
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		i__2 = jy;
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		i__3 = jy;
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		i__4 = j + j * a_dim1;
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		d__1 = A(j,j).r;
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		q__2.r = d__1 * temp1.r, q__2.i = d__1 * temp1.i;
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		q__1.r = Y(jy).r + q__2.r, q__1.i = Y(jy).i + q__2.i;
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		Y(jy).r = q__1.r, Y(jy).i = q__1.i;
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		ix = jx;
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		iy = jy;
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		i__2 = *n;
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		for (i = j + 1; i <= *n; ++i) {
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		    ix += *incx;
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		    iy += *incy;
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		    i__3 = iy;
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		    i__4 = iy;
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		    i__5 = i + j * a_dim1;
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		    q__2.r = temp1.r * A(i,j).r - temp1.i * A(i,j).i, 
kusano 7d535a
			    q__2.i = temp1.r * A(i,j).i + temp1.i * A(i,j)
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			    .r;
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		    q__1.r = Y(iy).r + q__2.r, q__1.i = Y(iy).i + q__2.i;
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		    Y(iy).r = q__1.r, Y(iy).i = q__1.i;
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		    r_cnjg(&q__3, &A(i,j));
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		    i__3 = ix;
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		    q__2.r = q__3.r * X(ix).r - q__3.i * X(ix).i, q__2.i =
kusano 7d535a
			     q__3.r * X(ix).i + q__3.i * X(ix).r;
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		    q__1.r = temp2.r + q__2.r, q__1.i = temp2.i + q__2.i;
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		    temp2.r = q__1.r, temp2.i = q__1.i;
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/* L110: */
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		}
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		i__2 = jy;
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		i__3 = jy;
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		q__2.r = alpha->r * temp2.r - alpha->i * temp2.i, q__2.i = 
kusano 7d535a
			alpha->r * temp2.i + alpha->i * temp2.r;
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		q__1.r = Y(jy).r + q__2.r, q__1.i = Y(jy).i + q__2.i;
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		Y(jy).r = q__1.r, Y(jy).i = q__1.i;
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		jx += *incx;
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		jy += *incy;
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/* L120: */
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	    }
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	}
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    }
kusano 7d535a
kusano 7d535a
    return 0;
kusano 7d535a
kusano 7d535a
/*     End of CHEMV . */
kusano 7d535a
kusano 7d535a
} /* chemv_ */
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