MB04TU - SLICOT Library Routine Documentation

## MB04TU

### Applying a row-permuted Givens transformation to two row vectors

[Specification] [Arguments] [Method] [References] [Comments] [Example]

Purpose

      To perform the Givens transformation, defined by C (cos) and S
      (sin), and interchange the vectors involved, i.e.

         |X(i)|    | 0   1 |   | C   S |   |X(i)|
         |    | := |       | x |       | x |    |, i = 1,...N.
         |Y(i)|    | 1   0 |   |-S   C |   |Y(i)|

      REMARK. This routine is a modification of DROT from BLAS.
              This routine is called only by the SLICOT routines MB04TX
              and MB04VX.

Numerical Aspects

      The algorithm is backward stable.

Specification

          SUBROUTINE MB04TU( N, X, INCX, Y, INCY, C, S )
    C     .. Scalar Arguments ..
          INTEGER           INCX, INCY, N
          DOUBLE PRECISION  C, S
    C     .. Array Arguments ..
          DOUBLE PRECISION  X(*), Y(*)

Further Comments

      None

Example

Program Text

      None

Program Data

      None

Program Results

      None

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