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- HER(3F) Last changed: 11-2-98
-
-
- NNAAMMEE
- CCHHEERR, ZZHHEERR - Performs Hermitian rank 1 update of a complex Hermitian
- matrix
-
- SSYYNNOOPPSSIISS
- Complex
-
- CCAALLLL CCHHEERR ((_u_p_l_o,, _n,, _a_l_p_h_a,, _x,, _i_n_c_x,, _a,, _l_d_a))
-
- Double complex
-
- CCAALLLL ZZHHEERR ((_u_p_l_o,, _n,, _a_l_p_h_a,, _x,, _i_n_c_x,, _a,, _l_d_a))
-
- IIMMPPLLEEMMEENNTTAATTIIOONN
- IRIX systems
-
- DDEESSCCRRIIPPTTIIOONN
- These routines perform the following Hermitian rank 1 operation:
- _H
- _A <- _a_l_p_h_a _x _x + _A
- _H
- _a_l_p_h_a is a real scalar, _x is an _n-element vector, _x is the conjugate
- transpose of _x, and _A is an _n-by-_n Hermitian matrix.
-
- These routines have the following arguments:
-
- _u_p_l_o Character*1. (input)
- Specifies whether the upper or lower triangular part of
- array _a is referenced, as follows:
-
- _u_p_l_o= 'U' or 'u': only the upper triangular part of _a is
- referenced.
- _u_p_l_o= 'L' or 'l': only the lower triangular part of _a is
- referenced.
-
- _n Integer. (input)
- Specifies the order of matrix _A. _n >= 0.
-
- _a_l_p_h_a Scalar alpha.
- CCHHEERR: Real.
- ZZHHEERR: Double precision.
-
- _x Array of dimension 1+(_n-1) * |_i_n_c_x|. (input)
- CCHHEERR: Complex array.
- ZZHHEERR: Double complex array.
- Contains vector _x.
-
- _i_n_c_x Integer. (input)
- Specifies the increment for the elements of _x. _i_n_c_x must
- not be 0.
-
- _a Array of dimension (_l_d_a,_n). (input and output)
- CCHHEERR: Complex array.
- ZZHHEERR: Double complex array.
-
- Before entry with _u_p_l_o = 'U' or 'u', the leading _n-by-_n
- upper triangular part of array _a must contain the upper
- triangular part of the Hermitian matrix. The strictly lower
- triangular part of _a is not referenced. On exit, the upper
- triangular part of the updated matrix overwrites the upper
- triangular part of array _a.
-
- Before entry with _u_p_l_o = 'L' or 'l', the leading _n-by-_n
- lower triangular part of array _a must contain the lower
- triangular part of the Hermitian matrix. The strictly upper
- triangular part of _a is not referenced. On exit, the lower
- triangular part of the updated matrix overwrites the lower
- triangular part of array _a.
-
- The imaginary parts of the diagonal elements need not be
- set. They are assumed to be 0; on exit, they are set to 0.
-
- _l_d_a Integer. (input)
- On entry, _l_d_a specifies the first dimension of _a as declared
- in the calling program. _l_d_a >= MMAAXX(1,_n).
-
- NNOOTTEESS
- CCHHEERR/ZZHHEERR is a Level 2 Basic Linear Algebra Subprogram (Level 2 BLAS).
-
- When working backward (_i_n_c_x < 0), this routine starts at the end of
- the vector and moves backward, as follows:
-
- _x(1-_i_n_c_x * (_n-1)), _x(1-_i_n_c_x * (_n-2)), ..., _x(1)
-
- SSEEEE AALLSSOO
- SSYYRR(3F)
-
- This man page is available only online.
-