F06CHF applies a complex similarity rotation having real cosine and complex sine to a 2 by 2 complex Hermitian matrix.
F06CHF applies a complex similarity rotation, with parameters
c (real) and
s (complex), to a given
2 by
2 complex Hermitian matrix; that is, it performs the operation:
where
x and
z are real.
The parameter
X and
Z which hold
x and
z are declared
complex
for convenience when using the routine to operate on submatrices of larger Hermitian matrices.
Note that:
where
w=-s-, so to use F06CHF
when
y is the
2,1 element of the matrix, you can make the call
CALL F06CHF(Z, Y, X, C, -CONJG(S))
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