?rot

Developer Reference for Intel® oneAPI Math Kernel Library for C

Download PDF

ID 766684

Date 4/28/2026

Version

Public

?rot

Performs rotation of points in the plane.

Syntax

void cblas_srot(const MKL_INT n, float *x, const MKL_INT incx, float *y, const MKL_INT incy,
                const float c, const float s);

void cblas_drot(const MKL_INT n, double *x, const MKL_INT incx, double *y, const MKL_INT incy,
                const double c, const double s);

void cblas_crot(const MKL_INT n, void *x, const MKL_INT incx, void *y, const MKL_INT incy,
                const float c, const void *s);

void cblas_zrot(const MKL_INT n, void *x, const MKL_INT incx, void *y, const MKL_INT incy,
                const double c, const void *s);

void cblas_csrot(const MKL_INT n, void *x, const MKL_INT incx, void *y, const MKL_INT incy,
                 const float c, const float s);

void cblas_zdrot(const MKL_INT n, void *x, const MKL_INT incx, void *y, const MKL_INT incy,
                 const double c, const double s);

Include Files

mkl.h

Description

Given two complex vectors x and y , each vector element of these vectors is replaced as follows:

xi = c*xi + s*yi
yi = c*yi - s*xi

If s is a complex type, each vector element is replaced as follows:

xi = c*xi + s*yi
yi = c*yi - conj(s)*xi

Input Parameters

n

Specifies the number of elements in vectors x and y .

x: REAL for srot DOUBLE PRECISION for drot COMPLEX for csrot DOUBLE COMPLEX for zdrot Array, size at least (1 + (n-1)*abs(incx)) .

incx

Specifies the increment for the elements of x .

y: REAL for srot DOUBLE PRECISION for drot COMPLEX for csrot DOUBLE COMPLEX for zdrot Array, size at least (1 + (n -1)*abs(incy)) .

incy

Specifies the increment for the elements of y .

c: REAL for srot DOUBLE PRECISION for drot REAL for csrot DOUBLE PRECISION for zdrot A scalar.
s: REAL for srot DOUBLE PRECISION for drot COMPLEX for crot DOUBLE COMPLEX for zrot REAL for csrot DOUBLE PRECISION for zdrot A scalar.

Output Parameters

x: Each element is replaced by c*x + s*y .
y: Each element is replaced by c*y - s*x , or by c*y-conj(s)*x if s is a complex type.

BLAS 95 Interface Notes

There exist FORTRAN 77 and FORTRAN 95 interfaces for this routine. See the Intel® oneMKL Fortran Developer Reference for details.

Select Your Language

Using Intel.com Search

Quick Links

Recent Searches

Advanced Search

Only search in

Developer Reference for Intel® oneAPI Math Kernel Library for C

?rot

Syntax

Include Files

Description

Input Parameters

Output Parameters

BLAS 95 Interface Notes