# naginterfaces.library.blas.zrot2¶

naginterfaces.library.blas.zrot2(x, y, z, c, s)[source]

zrot2 applies a complex similarity rotation having real cosine and complex sine to a complex Hermitian matrix.

For full information please refer to the NAG Library document for f06ch

https://www.nag.com/numeric/nl/nagdoc_28.7/flhtml/f06/f06chf.html

Parameters
xcomplex

The value , the element of the input matrix.

ycomplex

The value , the element of the input matrix.

zcomplex

The value , the element of the input matrix.

cfloat

The value , the cosine of the rotation.

scomplex

The value , the sine of the rotation.

Returns
xcomplex

The transformed value .

ycomplex

The transformed value .

zcomplex

The transformed value .

Notes

No equivalent traditional C interface for this routine exists in the NAG Library.

zrot2 applies a complex similarity rotation, with parameters (real) and (complex), to a given complex Hermitian matrix; that is, it performs the operation:

where and are real.

The argument and which hold and are declared complex for convenience when using the function to operate on submatrices of larger Hermitian matrices.

Note that:

where , so to use zrot2 when is the element of the matrix, you can make the call to zrot2 using