/sys$common/syshlp/helplib.hlb FORTRAN, Intrinsic Procedures, xROT *Conan The Librarian (sorry for the slow response - running on an old VAX) |
SROT (n, x, incx, y, incy, c, s) DROT (n, x, incx, y, incy, c, s) CSROT (n, x, incx, y, incy, c, s) ZDROT (n, x, incx, y, incy, c, s) Subroutines that apply a Givens plane rotation to a pair of arrays. CSROT and ZDROT apply a real rotation to a pair of complex arrays. These routines are part of the BLAS1 Basic Set, and are only available on VAX processors. Arguments n Integer number of elements in arrays "x" and "y" to be accessed. x Array containing the elements to be accessed or array reference to the first such element. The data type is REAL*4 for SROT, REAL*8 for DROT, COMPLEX*8 for CSROT, COMPLEX*16 for ZDROT. incx Integer index increment used in selecting which elements of array "x" are accessed. y Array containing the elements to be accessed or array reference to the first such element. The data type is REAL*4 for SROT, REAL*8 for DROT, COMPLEX*8 for CSROT, COMPLEX*16 for ZDROT. incy Integer index increment used in selecting which elements of array "y" are accessed. c First rotation element, which can be interpreted as the cosine of the angle of rotation. This argument can be generated by the xROTG routines. The data type is REAL*4 for SROT and CSROT, REAL*8 for DROT and ZDROT. s Second rotation element, which can be interpreted as the sine of the angle of rotation. This argument can be generated by the xROTG routines. The data type is REAL*4 for SROT, REAL*8 for DROT, COMPLEX*8 for CSROT and COMPLEX*16 for ZDROT
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